Mathematics for IGCSE & O level - Sequences (Section 1 - No. 12)

Which term of the sequence 5, 9, 13, 17,... is 41?

8th

9th

10th

11th

The formula is 4n+1. 41-1 = 40, and 40/4 is 10, therefore, the term is at the 10th term.