Question 140

Select the number from the given options that can replace the question mark (?) in the following series.
4, 11, 26, ?, 120, 247

Solution

The pattern in this sequence is as follows:

if w,x,y,z is the sequence.

x=w*2+3

y=x*2+4

z=y*2+5

Let's look at the original sequence.

11 = 4*2+3

26 = 11*2+4

? = 26*2+5

120 = ?*2+6

247 = 120*2+7

$$\Rightarrow$$ ? = 26*2+5=57

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Select the number from the given options that can replace the question mark (?) in the following series.4, 11, 26, ?, 120, 247