Question

check whether 7,12,17,22 is a.p if it an a.p find d and tn​

Answer 1

Answer:

The given sequence is an a.p. d=5. tn=2+5n

Answer 2

to check it is AP or not

d = 12-7 = 5

d= 17-12 =5

d= 22-17 = 5

here get common difference hence it is AP

Tn = a+(n-1)d

a= 7 ,d= 5 , n= 4

Tn= 7+(4-1)5 = 7+3×5 = 7+15 = 22

Tn= 22