Question

25th term of an ap 1,5,9

Answer 1

an ap is 1,5,9.....

t1=a=1,

t2=5

d=5-1=4

25th term therefore n=25

tn=a+(n-1)d

t25=1+(24)4

t25=97

therefore 25th term is 97 hope it helps mark me as brainliest

Answer 2

Answer:

97

Step-by-step explanation:

Here,

D (common difference) = 5-1 = 4

a (first term) = 1

no. of the term to be find (n) = 25

As we all know

S = a + (n-1)d

= 1+ 24(4)

= 1+96

= 97

Therefore the 25th term is 97

Hope it helps you............