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Number Series - Verbal and Reasoning

Q1:

Look at this series: 8, 6, 9, 23, 87 , ... What number should come next?

A 128

B 226

C 324

D 429

ANS:D - 429

8 x 1 - 2 = 6
6 x 2 - 3 = 9
9 x 3 - 4 = 23
23 x 4 - 5 = 87
87 x 5 - 6 = 429 ...