IBPS Government Jobs Exams Logical Reasoning Number Series

What will come in place of question mark (?) in the following series?
12, ?, 6, 9, 18, 45
A)10 B)6 C)5 D)9 E)None of theses

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IBPS Other Question

What value should come in place of question mark (?) in the given series: 12, 129, 233, 324, ?, 467
A)378 B)424 C)396 D)402 E)366 4 years ago, the ratio of age of A and B was 5 : 3. The sum of the present ages of A, B and C is 80 years. If present age of C is equal to the sum of present ages of A and B. What is present age of A?
A)20 yrs B)22 yrs C)18 yrs D)24 yrs E)26 yrs