Number series

Quantitative Aptitude (RBI Grade B)

Title

45:30

8 of 24 completed

5 of 15 completed

38 of 100 completed

8 of 20 completed

Indian Economy - Understanding the basics of Indian economic system

Odd man out: 3, 7, 15, 39, 63, 127, 255, 511

127

Each number in the series is multiplied by 2 and the result increased by 1 to obtain the next number.

So, 39 is wrong and should be replaced by (15 * 2 + 1) i.e. 31.

Hence, option 2 is the correct answer.