Question

In an A.P. if a=21, d=-3, and aₙ= 0, then the value of n is

Answer 1

Answer:

a=21

d= -3

an=0

a+(n-1)d=0

21+(n-1)(-3)=0

21-3n+3=0

-3n+24=0

-3n= -24

n= -24/-3

n=8

8th term if AP is 0

Answer 2

Answer:

8

Step-by-step explanation:

:

d=−2

n=5

a

n

=0

We know:

a

n

=a+(n−1)d

∴0=a+(5−1)(−2)

∴a=8

Hence, the value of a is 8.