Instructions

What should come in place of the question mark ? in the following number series ?

Question 65

10400, 2600, 650, ??, 40.625, 10.15625, 2.5390625

Solution

Each number in the series is equal to the previous number divided by four.

For example, 10400 = 2600*4
2600 = 650*4

40.625 = 10.15625 * 4
10.15625 = 2.5390625 *4

So, the number missing is 650/4 = 162.5

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