Question

If 2-5n is the nth term of the A.P. Then, the value of the first term is ​

Answer 1

$\huge\mathcal\purple{Answer}$

an = 2 - 5n

We need first term value, so substitute

n = 1

a1 = 2 - 5(1)

a1 = 2 - 5

a1 = -3

Answer 2

Answer:

-3n-7

Step-by-step explanation:

Given Sn=2-5n

Sn-1= 2(n-1)-5(n-1)

= 2n-2-2-5n-5+5

=2n-5n-2-2-2+5

=-3n-4+3

=-3n-7