Question

Here are the first four terms of a sequence.
7 11 15 19
Find the nth term of this sequence

Answer 1

nth term is a+(n-1)d
here a=7 and d=4
and the answer is 3+4n

Answer 2

Clearly its an arithmetic progression with first term as 7 and common difference is 11-7=4
So nth term is given by
a+(n-1)d
7+(n-1)×4
7+4n-4
4n+3