Question

if 7,k,21 are in AP. Then find the value of k ​

Answer 1

Answer:

first find the common difference

d1= K-7

d2= 21-k

for the terms to be in A.P. ,common difference must be same

d1= d2

k-7= 21-k

2k = 28

k=14

Answer 2

Answer:

if a,b,c are in ap then 2b=a+c

Step-by-step explanation:

2k= 21+7

2k = 28

k =28/2

k= 14