Question

What will come in place of question mark (?) in the following number series?

1, 4, 20, 120, 840, ?

1. 6720
2. 5720
3. 4720
4. 7720

Answer 1

Correct Answer - Option 1 : 6720

Given:

1, 4, 20, 120, 840, ?

Calculation:

1 × 4 = 4

4 × 5 = 20

20 × 6 = 120

120 × 7 = 840

840 × 8 = 6720

? = 6720

∴ In the place of '?' the value will be 6720.