Find the next number: 2, 6, 12, 20, 30, ?
A40
B36
C42
D44
Answer & Solution
Correct answer: C. 42
Differences: 4, 6, 8, 10 (increasing by 2). Next difference = 12. So 30 + 12 = 42. Equivalent: n(n+1) for n=1,2,3,... giving 2, 6, 12, 20, 30, 42.
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