Question

Find the common difference of the A.P whose first term is 12 and fifth term is zero

Answer 1

Answer: -4

Step-by-step explanation:

n=5

a=12(i) [Given]

a+4d=0(ii) [ Application of AP formula: a+(n-1)d ]

On substitution of (i) in (ii) we get:

12+4d=0

= 4d = -12

= d = -4

Answer 2

Answer:

4

Step-by-step explanation:

a1= 12

a5 =0

cd= a5÷a1

a5= a+4d=0...........(1)

a1=a+d=12..............(2)

1= a+d=0

2=a+4d=12

_______

a and a cancel

d-4d =-3d

0-12=-12

-3d=-12

(- )and( -) cancel

3d = 12

d=12/3

d= 4

hope it would help you..........