Question

What will come in place of the question mark (?) in the following series?

21      84       168        172      ?      348

A 346 Correct Answer Incorrect Answer
B 342 Correct Answer Incorrect Answer
C 340 Correct Answer Incorrect Answer
D 344 Correct Answer Incorrect Answer
E None of these Correct Answer Incorrect Answer

Solution

21 + 4 = 84 84 x 2 = 168 168 + 4 = 172 172 x 2 =  344 344 + 4 = 348

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