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Mathematics for IGCSE & O level - Sequences (Section 2 - No. 28)

Find the nth term formula for the sequence 4, 7, 12, 19, 28,...
n^2 + 3
n^2+2n+1
n^2 + 3n
n^2+2n

Uitleg

Use the method of finding the second differences to identify this sequence.

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