Question

which term of AP 3,8,13......248

Answer 1

here
a=3 , d=8-3=5, an=248, n=?
an=a+(n-1)d
248=3+(n-1)×5
248-3=(n-1)×5
245=(n-1)×5
245÷5=n-1
49=n-1
n=49+1
n=50

Answer 2

a=3, d=a2-a1=8-3=5, AP=248
an=a+(n-1)d
248=3+(n-1)5
248-3=5n-5
245+5=5n
250=5n
n=250/5n
[n=50] answer