Question

Find the missing number in the following number series:

7, 7, 21, 105, ?, 6615

A 735 Correct Answer Incorrect Answer
B 840 Correct Answer Incorrect Answer
C 650 Correct Answer Incorrect Answer
D 525 Correct Answer Incorrect Answer
E None of these Correct Answer Incorrect Answer

Solution

The series follows the pattern: 7 × 1 = 7 7 × 3 = 21 21 × 5 = 105 105 × 7 = 735 735 × 9 = 6615

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