No products in the cart.

find the 31st term of an …

CBSE, JEE, NEET, CUET

Question Bank, Mock Tests, Exam Papers

NCERT Solutions, Sample Papers, Notes, Videos

Install Now

find the 31st term of an AP whose 11th term is 38 and 16th term is 73

Posted by Anant Thapa 6 years, 4 months ago

CBSE > Class 10 > Mathematics

1 answers

Sia ? 6 years, 4 months ago

Here a₁₁ =38 and a₁₆ =73
Using formula a_n =a +(n−1)d, to find n^th term of arithmetic progression,
38=a +(11−1) (d) And 73=a +(16−1)(d)
⇒ 38=a +10d And 73=a +15d
These are equations consisting of two variables.
We have, 38=a +10d ⇒ a =38−10d
Let us put value of a in equation (73=a +15d),
73=38−10d +15d ⇒ 35=5d
Therefore, Common difference =d =7
Putting value of d in equation 38=a +10d ,
38=a +70 ⇒ a =−32
Therefore, common difference = d = 7 and First term = a = -32
Using formula a_n =a +(n−1)d , to find n^th term of arithmetic progression,
a₃₁=-32+(31−1)(7) =−32+210=178
Therefore, 31^st term of AP is 178.

0Thank You

ANSWER

Test

Related Questions

If 1/2 is a root of equation x^2+kx- 5/4 =0 , then what is the value of k

Posted by Parinith Gowda Ms 4 months, 1 week ago

CBSE > Class 10 > Mathematics

1 answers

Find the nature of quadratic equation x^2 +x -5 =0

Posted by Parinith Gowda Ms 4 months, 1 week ago

CBSE > Class 10 > Mathematics

0 answers

Is it possible to design a rectangular mango Grove whose length is twice it's breadth, and the area is 800m²? If so, find it's length and breadth

Posted by Akshata Choukse 1 year, 5 months ago

CBSE > Class 10 > Mathematics

0 answers

(A + B )²

Posted by Abhishek Gupta 2 months, 2 weeks ago

CBSE > Class 10 > Mathematics

1 answers

This content has been hidden. One or more users have flagged this content as inappropriate. Once content is flagged, it is hidden from users and is reviewed by myCBSEguide team against our Community Guidelines. If content is found in violation, the user posting this content will be banned for 30 days from using Homework help section. Suspended users will receive error while adding question or answer. Question comments have also been disabled. Read community guidelines at https://mycbseguide.com/community-guidelines.html

Few rules to keep homework help section safe, clean and informative.

Don't post personal information, mobile numbers and other details.
Don't use this platform for chatting, social networking and making friends. This platform is meant only for asking subject specific and study related questions.
Be nice and polite and avoid rude and abusive language. Avoid inappropriate language and attention, vulgar terms and anything sexually suggestive. Avoid harassment and bullying.
Ask specific question which are clear and concise.

Remember the goal of this website is to share knowledge and learn from each other. Ask questions and help others by answering questions.

Posted by Kanika . 1 month, 4 weeks ago

CBSE > Class 10 > Mathematics

1 answers

Venu Gopal has twice

Posted by Lakshay Kumar 1 year, 1 month ago

CBSE > Class 10 > Mathematics

0 answers

X-y=5

Posted by Kishan Thakur 1 month, 4 weeks ago

CBSE > Class 10 > Mathematics

1 answers

Don't post personal information, mobile numbers and other details.
Don't use this platform for chatting, social networking and making friends. This platform is meant only for asking subject specific and study related questions.
Be nice and polite and avoid rude and abusive language. Avoid inappropriate language and attention, vulgar terms and anything sexually suggestive. Avoid harassment and bullying.
Ask specific question which are clear and concise.

Remember the goal of this website is to share knowledge and learn from each other. Ask questions and help others by answering questions.

Posted by Hari Anand 7 months ago

CBSE > Class 10 > Mathematics