Question

First term and common difference of an ap are 12 and 4 respectively. If tn=96 find n formula of tn

Answer 1

here
a=12
d=4
tn=96
n=?

then
tn=a+(n-1)×d
96=12+(n-1)×4
96-12/4=n-1
84/4=n-1
21=n-1
n=21+1
n=22

therefore
the value of n is 22