Question 27

Which number will replace the question mark (?) in the following number series?
5, 4, 6, 15, 56, ?

Solution

Given Series : 5, 4, 6, 15, 56, ?

The pattern followed here is :

$$5\times\ 1\ -\ 1=4$$
$$4\times\ 2\ -\ 2=6$$
$$6\times\ 3\ -\ 3=15$$
$$15\times\ 4\ -\ 4=56$$
$$56\times\ 5\ -\ 5=275$$

So, 275 is the term which will replace the ?

Hence, Option C is correct.

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