Question

If (m + 2) term of an A.P. is (m + 2)2 - m?, then
its common difference is
(A) 4 (B)-4 (C)2 (D)-2.​

Answer 1

Answer:

t _(m+2)=2m+4-m=m+4

so put m= n-2

tn=n+2

so a=t1=3

a+d=t2=4

so d=1