Question 39

Which number will replace the question mark (?) in the following number series?
256, 123, 66, ?, 18, 6

Solution

Given Series,

256, 123, 66, ?, 18, 6

The pattern follows here is :

we see it from right hand side,

$$\therefore\ \left(6\times\ 2\right)+6=18$$

$$\therefore\ \left(18\times\ 2\right)-7=29$$

$$\therefore\ \left(29\times\ 2\right)+8=66$$

$$\therefore\ \left(66\times\ 2\right)-9=123$$

$$\therefore\ \left(123\times\ 2\right)+10=256$$

Hence, Option C is correct.

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Which number will replace the question mark (?) in the following number series?256, 123, 66, ?, 18, 6