Question

Question 20:
Which number replaces the question mark?
6
11
9
21
4.
16,
14)
?​

Answer 1

Answer:

15

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Answer 2

Answer:

We see that certain numbers are missing in the given series. We will first figure out the numbers missing and the relationship between them. This is a necessary step to determine if the '?' will be replaced with a number after a missing number or it'll continue as the series.

The missing numbers are,

1,5,10,16

We see that the numbers missing are- 1,5 and two digit numbers are 10,16- the sum of the two numbers of the two digit numbers are 1+0=1 and 1+6=7

We see that the series is omitting odd numbers or 2 digit numbers where the sum of the two digits is an odd number.

So the next number should be 22.