Question on: JAMB Mathematics - 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)
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Correct Option: C
\(\frac{(n + 1)(n + 2)}{2}\)
If n = 1, the expression becomes 3
n = 2, the expression becomes 6
n = 4, the expression becomes 15
n = 5, the expression becomes 21
If n = 1, the expression becomes 3
n = 2, the expression becomes 6
n = 4, the expression becomes 15
n = 5, the expression becomes 21
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