Question

which term of following ap is 64? 4,5.6 ,6.4​

Answer 1

Answer:

4,5.6,6.4,........,an=64.

a=4.

d=a2-a1=5.6-4=1.6.

an=a+(n-1)d.

64=4+(n-1)(1.6).

64=4+1.6n-1.6.

64=2.4+1.6n.

1.6n=64-2.4.

1.6n=62.4.

n=62.4/1.6.

n=39.

39th term is 64.