Question

the nth term of arithmatic progression is 2n + 5, then the common difference is

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Answer 1

The nth term of A.P is . Therefore, the common difference of the A.P is 2.

Answer 2

hence,the c.d is 2

Given: the nth term of A.p is 2n+5

To find: common difference of A.P

Proof:

an= 2n+5

Let, n= 1

a1= 2(1)+5

a1=7

now, let n=2

a2= 2(2)+5

a2= 9

therefore,common difference= a2-a1

= 9-7

=2