<h2>What-number-will-replace-the-question-mark#Puzzle65 missing-number</h2>

 Collection find the missing number

Creator Panos Kalliantasis #Puzzle 65

One more puzzle to familiarize yourself with the find the missing number exercises that are often found in exams.

 Dedective the pattern.

What number will replace the question mark in the table?

Scroll down to compare your answer

Answer

If the numbers of a column are A.B,C.D

The pattern is:

A^2-B^2=C

C^2-B^2=D

First column

3^2-2^2=9-4=5

5^2-2^2=25-4=21

Second column

9^2-4^2=81-16=65

Third coumn

8^2-1^2=64-1=63

Fourth column

7^2-3^2=49-9=40

Correct answer is 40

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