Counsellor: A counsellor helps people solve problems in daily living. He/she may work with students, advising them about personal problems and career planning.
Clinical psychologist: A clinical psychologist has a degree in psychology, which includes intensive training in treating people with psychological disorders.

Demand in terms of economics may be explained as the consumers’ willingness and ability to purchase or consume a given item/good. Furthermore, the determinants of demand go a long way in explaining the demand for a particular good.

Relative Velocity

This is the velocity of an object relative to some other object which might be stationary, moving slowly, moving with same velocity, moving with higher velocity or moving in opposite direction.

According to question, series is 105, 110, 115, 120, ………, 995
Here a = 105, d = 110 - 105 = 5 and a_n = 995
{tex}\therefore{/tex}  a_n = a + (n - 1)d
{tex}\Rightarrow 995 = 105 + ( n - 1 ) \times 5{/tex}

{tex}\Rightarrow 995 - 105 = ( n - 1 ) \times 5{/tex}

{tex}\Rightarrow \frac { 890 } { 5 } = ( n - 1 ){/tex}

{tex}\Rightarrow{/tex} n = 178 + 1 = 179

Now, {tex}\mathrm { S } _ { n } = \frac { n } { 2 } ( a + l ){/tex}

{tex}\Rightarrow S _ { 199 } = \frac { 179 } { 2 } ( 105 + 995 ){/tex}

{tex}\Rightarrow S _ { 179 } = \frac { 179 } { 2 } \times 1100=98450{/tex}

Indian Constitution begins with a Preamble. The Preamble serves the purpose of a window through which we peep into the intentions of the makers of the constitution. In fact, the Preamble is a summary of the objectives and basic philosophy of the constitution. The Preamble is the Mirror of the Constitution. The basic philosophy of the Indian Constiution is as follows:

1. People are the source of Authority: The Preamble expresses in a very clear language that people are the ultimate source of all authority. It is the people who have adopted and enacted the constitution. The constitution originates from the people of India and is promulgated in the name of the people of India.
2. Socialist State: By 42nd Amendment the word ‘Socialist’ is inserted in the Preamble of the Constitution. The government is committed to socialism.
3. Secularism: Indian Constitution is based on the philosophy of secularism. India is a Secular State. All citizens enjoy freedom of religion and there is no official religion of the state.
4. Democratic Principles: All democratic principles are adopted in the Indian Constitution.
5. Justice: The basic philosophy of the Constitution is that all the citizens of India should get justice in every sphere of life. In the preamble the idea of achieving social, economic and political justice for all citizens has been mentioned. To achieve social, economic, and political justice provisions have been made in the Constitution.
6. Liberty: Indian Constitution is based on the philosophy of freedom. The citizens of India have been guaranteed a number of freedoms by the Constitution. Some of the very important freedoms such as freedom of thought, freedom of expression, freedom of belief and worship, etc., are mentioned in the preamble.

The atomic number of Rb is 37.

The characteristics are:
1. A period of Rapid Physical/Biological Changes, has Psychological Repercussions Too
2. Appearance-Consciousness
3. Attraction Towards the Opposite ***
4. Cognitive Development
5. Career-Consciousness
6. Emotional Conditions
7. Flight on Imagination
8. Hero Worship
9. Hobbies and Other Details.

tan 20° tan 40° tan 60° tan 80°
= (tan 20° tan 40° tan 80°) {tex}\sqrt {3}{/tex} {tex}\left[\because \tan 60^{\circ}=\sqrt{3}\right]{/tex}
{tex}=\left(\frac{\sin 20^{\circ} \sin 40^{\circ} \sin 80^{\circ}}{\cos 20^{\circ} \cos 40^{\circ} \cos 80^{\circ}}\right) \sqrt{3}{/tex}
{tex}=\frac{\left(2 \sin 20^{\circ} \sin 40^{\circ}\right) \sin 80^{\circ} \times \sqrt{3}}{\left(2 \cos 20^{\circ} \cos 40^{\circ}\right) \cos 80^{\circ}}{/tex}
Applying
{tex}\Rightarrow{/tex} 2 sin A sin B = cos (A - B) - cos (A + B)
2 cos A cos B - cos (A + B) + cos (A - B)
{tex}\frac{\left(\cos \left(40^{\circ}-20^{\circ}\right)-\cos \left(40^{\circ}+20^{\circ}\right)\right) \sin 80^{\circ} \times \sqrt{3}}{\left(\cos \left(20^{\circ}+40^{\circ}\right)+\cos \left(40^{\circ}-20^{\circ}\right)\right) \cos 80^{\circ}}{/tex}
{tex}=\frac{\left(\cos 20^{\circ}-\cos 60^{\circ}\right) \sin 80^{\circ} \times \sqrt{3}}{\left(\cos 60^{\circ}+\cos 20^{\circ}\right) \cos 80^{\circ}}{/tex}
{tex}=\frac{\left(\cos 20^{\circ}-\frac{1}{2}\right) \sin 80^{\circ} \times \sqrt{3}}{\left(\frac{1}{2}+\cos 20^{\circ}\right) \cos 80^{\circ}}{/tex}
{tex}=\frac{\left(2 \sin 80^{\circ} \cos 20^{\circ}-\sin 80^{\circ}\right) \sqrt{3}}{\cos 80^{\circ}+2 \cos 20^{\circ} \cos 80^{\circ}}{/tex}
{tex}\Rightarrow{/tex} 2 sin A cos B - sin (A + B) + sin (A - B)
{tex}=\frac{\left(\sin \left(80^{\circ}+20^{\circ}\right)+\sin \left(80^{\circ}-20^{\circ} \right)-\sin \theta 0^{\circ}\right) \sqrt{3}}{\cos 80^{\circ}+\left(\cos \left(20^{\circ}+80^{\circ}\right)+\cos \left(80^{\circ}-20^{\circ}\right)\right)}{/tex}
{tex}=\frac{\left(\sin 100^{\circ}+\sin 60^{\circ}-\sin 80^{\circ}\right) \sqrt{3}}{\cos 80^{\circ}+\cos 100^{\circ}+\cos 60^{\circ}}{/tex}
{tex}=\frac{\left(\sin \left(180^{\circ}-80^{\circ}\right)+\frac{\sqrt{3}}{2}-\sin 80^{\circ}\right) \sqrt{3}}{\cos 80^{\circ}+\cos \left(180^{\circ}-80^{\circ}\right)+\cos 60^{\circ}}{/tex}
{tex}=\frac{\left(\sin 80^{\circ}+\frac{\sqrt{3}}{2}-\sin 80^{\circ}\right) \sqrt{3}}{\cos 80^{\circ}-\cos 80^{\circ}+\cos 60^{\circ}}{/tex}
{tex}=\frac{\frac{3}{2}}{\frac{1}{2}}{/tex} = 3 = RHS

Some gaps were left for the elements yet to be discovered. Thus, if a certain new element is discovered, it can be placed in a new group without disturbing any existing group.