alleryFind the next number in the series: 4, 9, 20, 43, ?
A100
B90
C92
D82
Answer & Solution
Correct answer: B. 90
1. 4 x 2 + 1 = 9; 9 x 2 + 2 = 20.
2. 20 x 2 + 3 = 43.
3. 43 x 2 + 4 = 90.
_Source: RRB Group D CEN-02/2018 PYQ, Q.61._
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