Nth term - Jamb Mathematics Past Questions and Answers

Question 1:

• JAMB 2019

The nth term of a sequence is given by 2\(^{2n - 1}\). Find the sum of the first four terms.

A. 74
B. 32
C. 42
D. 170

Question 2:

• JAMB 1991

What is the nth term of the progression 27, 9, 3,......?

A. 27\(\frac{1}{3}\) ^{n - 1}
B. 3^{n + 2}
C. 27 + 18(n - 1)
D. 27 + 6(n - 1)

Question 3:

• JAMB 1992

What is the n-th term of the sequence 2, 6, 12, 20...?

A. 4n - 2
B. 2(3^{n - 1})
C. N² + n
D. N² + 3n + 2

Question 4:

• JAMB 1994

Find the nth term of the sequence 3, 6, 10, 15, 21.....

A. \(\frac{n(n - 1)}{2}\)
B. \(\frac{n(n + 1)}{2}\)
C. \(\frac{(n + 1)(n + 2)}{2}\)
D. N(2n + 1)

Question 5:

• JAMB 1997

Sn is the sum of the first n terms of a series given by Sn = n\(^2\) - 1. Find the nth term

A. 4n + 1
B. 4n - 1
C. 2n + 1
D. 2n - 1