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Find the missing term: 5, 9, 17, 33, 65, ?
A127
B129
C128
D130
Answer & Solution
Correct answer: B. 129
1. Observe: 9 = 2*5 - 1, 17 = 2*9 - 1, 33 = 2*17 - 1, 65 = 2*33 - 1.
2. Rule: each term is double the previous minus 1.
3. Next = 2*65 - 1 = 129.
4. So missing term is 129.
_Source: ICAI BoS Foundation Paper 3, Ch 9 'Series', p.5_
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