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Question

Find the nth term of sequence 3, 8, 15, ...

A
n2 - 1
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B
n2 + 2
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C
n2 + 2n
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D
n2 - 2n
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Solution

The correct option is C n2 + 2n
T1 = 3 = 1×3 = 3
T2 = 8 = 2×4 = 8
T3 = 15 = 3×5 = 15
thus
Tn = n×(n+2) or
= n2 + 2n

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