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

Question 1 Report

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

\frac{n (n - 1)}{2}

\frac{n (n + 1)}{2}

\frac{(n + 1) (n + 2)}{2}

n(2n + 1)

Answer Details

$\frac{(n + 1) (n + 2)}{2}$
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

Read lesson note on Sequence And Series (WAEC)

Sequence And Series

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