Find out the missing number in the following number series.
1) 1, 2, 7, ?, 111, 564
A.28
B.26
C.14
D.21
E.18
Sol:
1 * 1 + 1 = 2
26 * 4 + 7 = 111
111 * 5 + 9 = 564
2 * 2 + 3 = 7
7 * 3 + 5 = 26
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