Question

9. Write the sum of first n even natural numbers.

10. If the sum of n terms of an A.P.is S, = 3n2 + 5n. Write its common difference.

11. Write the expression for the common difference of an A.P. whose first term is A and nth
term is B.

12. The first term of an A.P. is p and its common difference is q. Find its 10th term.
[CBSE 2008]

13. For what value of p are 2p + 1, 13,5p - 3 are three consecutive terms of an A.P.?
(CBSE 2009]

14. If 4/5, a, 2 are three consecutive terms of an A.P., then find the value of a. [CBSE 2009]

15. If the sum of first p term of an A.P. is ap? + bp, find its common difference. (CBSE 2010]​

Answer 1

Answer:

it answer of questions 9....

Step-by-step explanation:

hope it helps

Answer 2

Step-by-step explanation:

first we put n=1 the we get first term.

And we put the value n=2. so we get the sum of two terms.

2nd term = S2 - S1. Then we get 2nd term.

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it answer is question 10