Question

Out of nine cells of a square, one cell is left blank and in the rest of the cells, numbers are written follow some rule. Get the rule and find out the proper option for the blank cell

2	72	56
?	0	42
12	20	30

• A. 4
• B. 6
• C. 8
• D. 10

Answer 1

The correct option is B 6

The pattern of numbers are as followed
$1^2-1=0$
$2^2-1=3$
$3^2-3=6$
$4^2-4=12$
$5^2-5=20$
$6^2-6=30$
$7^2-7=42$
$8^2-8=56$
$9^2-9=72$