Question

If the first term of a.p is 1 and common difference is 4,then which term of A.p is 77

Answer 1

Answer:

n=20

Step-by-step explanation:

a=1. d=4. an=77

an=a+(n-1)d

77=1+(n-1)4

76=4n-4

4n=76+4

4n=80

n=80/4

n=20