Question

if k-1, k+1, 2k+3 are in AP. find k​

Answer 1

Answer:

0

Step-by-step explanation:

In APs, 2* middle term = 1st term + 3rd term.

Here, if we say a, b and c are in AP, so

2b = a + c

Here,

→ 2(k + 1) = k - 1 + 2k + 3

→ 2k + 2 = 3k + 2

→ 2 - 2 = 3k - 2k

→ 0 = k

Answer 2

the given series is not in AP because the difference between two terms is changing from term 1-2 and from term 2-3.