Question

11. In an AP, the sum of first ten terms is - 150 and the sum of next ten terms
Find AP
12. For what value of k will k+9, 2k-1 and 2k + 7 are consecutive terms of AP
13. If the fourth term of an AP is 0. Prove that the 25th term is triple of 11 term.
14. If the ratio of first n terms of two different AP's is (7n+1)84n+27). Find th
their m"hterms​

Answer 1

Step-by-step explanation:

by finding both of the difference which is d1 and d2 which are then equal bcz they are in AP

Answer 2

Answer:

I will just solve 1 question rest for u

Step-by-step explanation:

13)a+3d=0

a+24d= 3(a+10d)-2a-6d

= 3(a+10d)+0

mark as brain