Question

1) a, = an-1-9
a, = 25

Answer 1

an-1-9

25n-1-9

25n-10=0

25n=0+10

25n=10

divide both sides by 25

25n/25 =10/25

n=2/5

Explanation:

Answer 2

n=1.4

Explanation:

given a=25

a=an-1-9..............(1)

put a=25 in equ (1)

25=25n-1-9

25=25n-10

25n=25+10=35

n=
`(35)/(25)`=1.4

n=1.4 answer