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In a series 2, 6, 12, 20, 30, 42, the next term is
A60
B54
C50
D56
Answer & Solution
Correct answer: D. 56
1. Observe successive differences: 6-2=4, 12-6=6, 20-12=8, 30-20=10, 42-30=12.
2. Differences are 4, 6, 8, 10, 12 (an AP with common diff 2).
3. Next difference = 14.
4. So next term = 42 + 14 = 56.
_Source: ICAI BoS Foundation Paper 3, Ch 9 'Series', p.4_
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