Question

In the following number series, two numbers have been put within brackets. Study the series carefully and select the correct alternative with respect to the series.

0, 7, 26, 63, (124), 215, 342, (512)

1. The first bracketed number(from the left) is correct and the second is incorrect.
2. The first bracketed number (from the left) is incorrect and the second is correct.
3. Both the bracketed numbers are incorrect.
4. Both the bracketed numbers are correct.

Answer 1

Correct Answer - Option 1 : The first bracketed number(from the left) is correct and the second is incorrect.

The logic is :

Given:

0, 7, 26, 63, (124), 215, 342, (512) → Series of Cube - 1

0 → 1³ - 1 = 0

7 → 2³ - 1 = 7

26 → 3³ - 1 = 26

63 → 4³ - 1 = 63

(124) → 5³ - 1 = 124

215 → 6³ - 1 = 215

342 → 7³ - 1 = 342

(512) → 8³ - 1 = 511 ≠ 512

Hence, the first bracketed number(from the left) is correct and the second is incorrect is the correct answer.