Question

Complete the following series.
12, 14, 15, 16, 18, 20,
(A) 22
(C) 21
(B) 25
(D) 23​

Answer 1

(A) 22

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Answer 2

Answer:

C)21

Step-by-step explanation:

So, if we look deep into it we can see that the series
12, 14, 15, 16, 18, 20 is missing 13, 17 and 19

We know that 13, 17, and 19 are prime numbers, where as all the other numbers are composite number because
12 = 3 × 4
    = 2 × 6
14 = 2 × 7
15 = 3 × 5
16 = 2 × 8
   = 4 × 4
18 = 2 × 9
    = 3 × 6
20 = 2 × 10
    = 4 × 5

So, the next number will be 21 as,
21 = 3 × 7 is a composite number.