Question

What should come in place of the question mark (?) in the given series? 19 19 20 24 33 ?

• A. 51
• B. 48
• C. 50
• D. 49

Answer 1

Answer:

D. 49

Series:
19, 19, 20, 24, 33, ?

Step 1: Find the differences

• 19 → 19 = +0

• 19 → 20 = +1

• 20 → 24 = +4

• 24 → 33 = +9

Step 2: Observe the pattern

The differences are:

0, 1, 4, 9 → these are perfect squares
(0^2, 1^2, 2^2, 3^2)

Step 3: Find the next difference

Next square = (4^2 = 16)

Step 4: Find the missing number

33 + 16 = 49