Question

Q. a) Work out an expression to find the nth term of the sequence 5,8,11,....... b) find the 90th term of the sequence. *

Answer 1

The nth term is 3n+2.

The given sequence is in A.P.

Here,

First term,a= 5

Common difference,d= 3

Therefore the nth term = a+(n-1)d =5+(n-1)3

=5+3n-3 =3n+2.

Explanation: