Progression - Jamb Mathematics Past Questions and Answers

Question 26:

• 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 27:

• JAMB 1991

Find the sum of the first 20 terms in an arithmetic progression whose first term is 7 and last term is 117.

A. 2480
B. 1240
C. 620
D. 124

Question 28:

• JAMB 1992

Find the sum to infinity to the following series 3 + 2 + \(\frac{4}{3}\) + \(\frac{8}{9}\) + \(\frac{16}{17}\) + .....

A. 1270
B. 190
C. 18
D. 9

Question 29:

• 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 30:

• JAMB 1992

For an arithmetical sequence, the first term is 2 and the common difference is 3. Find the sum of the first 11 terms

A. 157
B. 187
C. 197
D. 200