Question

Find out the wrong number in the following given number series :

10                           19                           58                           115                         347                         691

A 10 Correct Answer Incorrect Answer
B 58 Correct Answer Incorrect Answer
C 691 Correct Answer Incorrect Answer
D 347 Correct Answer Incorrect Answer
E 19 Correct Answer Incorrect Answer

Solution

10 × 2 – 1 = 19 19 × 3 + 1 = 58 58 × 2 – 1 = 115 115 × 3 + 1 = 346 346 × 2 – 1 = 691

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