Question

The 7th term of an AP is -4 and it's 13th term is -16. Find the AP.​

Answer 1

given,

a+6d= -4

and

a+12d=-16

on solving these two equations

we get -6d=12

I.e.d=-2

by putting in equation 1

a=8

so, A. P. =a, a+d,a+2d,a+3d........

I. e. 8,6,4,2.....

Answer 2

Answer:

a+(7-1)d=-4

a+(13-1)d=-16

-6d=12

d=-2

Then the first term is :

a+6d=-4

a+6×-2=-4

a-12=-4

a=-4+12

a=8

THEN THE A.P. IS;

8, (8-2), (8-2×2), (8-2×3),.......

8, 6,4,2,0,-2,-4........

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