Question

11,8,5,2.....In thi A.P.which term is number -151?

Answer 1

Step-by-step explanation:

where d= 2nd term - 1st term

n can't be negative.

An= a+(n-1)d

-151=11+(n-1)(-3)

-151= 14-3n

3n= 165

n= 55

Thus 55th term is -151

Answer 2

Answer:

Given:

a = 11

d = a2-a1 = 8-11= -3

An = -151

To Find:

n term should be find

Proof:

An = a+[n-1]d

-151 = 11+[n-1](-3)

-151-11 = 3-3n

-162-3 = -3n

-165 = -3n

n = 55

Identified:

the n term is 55. -151 is 55th term