TCS Company Logical Reasoning Number Series

3, 12, 7, 26, 15, ?
a)54 b)27 c)108 d)31

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TCS Other Question

3, 22, 7, 45, 15,? , 31
a)91 b)151 c)90 d)5
5, 9, 12, 18, 26, 36, 47, 72, _?
a)75 b)135 c)100 d)55