CBSE > Class 10 > Mathematics | CBSE Board | Homework Help

Here Sum of the n terms of an Arithmetic progression, Sn = 5n² + 3n
S₁ = 5 {tex}\times{/tex} 1² + 3 {tex}\times{/tex} 1 = 8 = t₁ ....(i)
S₂ = 5 {tex}\times{/tex} 2² + 3 {tex}\times{/tex} 2 = 26 = t₁ + t₂ ...(ii)
S₃ = 5 {tex}\times{/tex} 3² + 3 {tex}\times{/tex} 3 = 54 = t₁ + t₂ + t₃ ...(iii)
From (i), (ii) and (iii),
t₁ = 8, t₂ = 18, t₃ = 28
So Common difference, d = 18 - 8 = 10 and first term a=8.
Now t_m = 168 (given)

We know that {tex}{T_m}=a+(m-1)d{/tex}
{tex}\Rightarrow{/tex} a + (m - 1)d = 168
{tex}\Rightarrow{/tex} 8 + (m - 1) {tex}\times{/tex} 10 = 168
{tex}\Rightarrow{/tex} (m - 1) {tex}\times{/tex} 10 = 160

{tex}\implies{/tex} m-1 ={tex}\frac{160}{10}{/tex}
{tex}\Rightarrow{/tex} m - 1 = 16
Therefore, m = 17
So, t₂₀ = a + (20 - 1)d
= 8 + 19 {tex}\times{/tex} 10
= 8 + 190
= 198

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Posted by Riya Monis 7 years, 3 months ago

CBSE > Class 10 > Mathematics

3 answers

Dilkhush Kumar 7 years, 3 months ago

It is non-terminating decimals.

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Ram . 7 years, 3 months ago

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Rakesh Kumar Tiwari 7 years, 3 months ago

(43123456789-43)/999999999 =43123456746/999999999

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CBSE > Class 10 > Mathematics

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CBSE > Class 10 > Mathematics

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CBSE > Class 10 > Mathematics

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CBSE > Class 10 > Mathematics

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CBSE > Class 10 > Mathematics

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Posted by Shivani Painuly 7 years, 3 months ago

CBSE > Class 10 > Mathematics

2 answers

Dilkhush Kumar 7 years, 3 months ago

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CBSE > Class 10 > Mathematics

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CBSE > Class 10 > Mathematics

2 answers

Anjali Agrahari 7 years, 3 months ago

Minerals in which high percentage of metals are found is known as ore.

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Bhawika Chetwani 7 years, 3 months ago

Ore mean rock or earth from which metal can be taken

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CBSE > Class 10 > Mathematics

1 answers

Iwhxhxsh Ghnhv 7 years, 3 months ago

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CBSE > Class 10 > Mathematics

0 answers

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CBSE > Class 10 > Mathematics

0 answers

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Posted by Shubham Yadav 7 years, 3 months ago

CBSE > Class 10 > Mathematics

3 answers

Dilkhush Kumar 7 years, 3 months ago

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Jignesh Sharma 7 years, 3 months ago

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Santosh Kyadari 7 years, 3 months ago

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Posted by The Monster Boy Ashutosh Kumar 7 years, 3 months ago

CBSE > Class 10 > Mathematics

1 answers

Polo .... 7 years, 3 months ago

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Bhaiyo! Before a few days i had asked a ques. And some answer were also suggested ,so now i want to share one of them. That was.. a girl reply that. 0/0=2 . We can cut 0/0 by 2 Wah...¿ So now i want to ask that is it possible?? AKS

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CBSE > Class 10 > Mathematics

2 answers

Polo .... 7 years, 3 months ago

In fact i have a ques too.. Is multiplication of 0 with LHS and RHS to prove them equal is valid? If not then why?

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Mohd Shahid 7 years, 3 months ago

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Posted by Piyush Patel 7 years, 3 months ago

CBSE > Class 10 > Mathematics

1 answers

Asif Ansari 7 years, 3 months ago

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CBSE > Class 10 > Mathematics

1 answers

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CBSE > Class 10 > Mathematics

1 answers

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CBSE > Class 10 > Mathematics

1 answers

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Posted by Tanya Ahuja 7 years, 3 months ago

CBSE > Class 10 > Mathematics