Question

2 3 5 12 50 408 6434 find out wrong number and logic

Answer 1

The wrong number is 408 (correct, 402).

Step-by-step explanation:

The given sequence:

3, 5, 12, 50, 408, 6434

To find, the wrong number = ?

The pattern follow:

Previous number × 1 + 2, Previous number × 2 + 2, Previous number × 4 + 2, Previous number × 8 + 2, Previous number × 16 + 2, ....

5 = 3 × 1 + 2 = 3 + 5 = 5

12 = 5 × 2 + 2 = 10 + 2 = 12

50 = 12 × 4 + 2 = 48 + 2 = 50

480 = 50 × 8 + 2 = 400 + 2 = 402 ≠ 408 (wrong number)

6434 = 402 × 16 + 2 = 6432 + 2 = 6434

Thus, the wrong number is 408 (correct, 402).