Direction: Find out the missing number in the following number series.
Q) 13, 26, 78, ?, 2730, 30030
A. 312
B. 390
C. 448
D. 273
E. 39
Sol:
13 * 2 = 26
26 * 3 = 78
78 * 5 = 390
390 * 7 = 2730
2730 * 11 = 30030
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