alleryFind next term: 6, 11, 21, 36, 56, ?
A81
B82
C78
D75
Answer & Solution
Correct answer: A. 81
1. Successive differences: 11-6=5, 21-11=10, 36-21=15, 56-36=20.
2. Differences form AP: 5, 10, 15, 20 (common diff 5).
3. Next difference = 25.
4. Next term = 56 + 25 = 81.
_Source: ICAI BoS Foundation Paper 3, Ch 9 'Series', p.5_
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