Question

In the following series, one of terms given is wrong. Find that term and mark that your answer.

1564, 780, 388, 192, 94, 45, 22.5

1. 94
2. 22.5
3. 780
4. 45
5. 192

Answer 1

Correct Answer - Option 2 : 22.5

Concept Used:

x × (1/2) - 2 = y

Calculations:

Series = 1564, 780, 388, 192, 94, 45, 22.5

1564 × (1/2) - 2 = 780

780 × (1/2) - 2 = 388

388 × (1/2) - 2 = 192 

192 × (1/2) - 2 = 94

94 × (1/2) - 2 = 45

45 × (1/2) - 2 = 20.5

⇒ Wrong number = 22.5

∴ The wrong number in given series is 22.5.