Book Maths Puzzle Numerical Ability Averages

Find the value of x
if,
A=4
B=14
C=x
D=76

Read Solution (Total 1)

a = 1^3 + 3 = 4
b = 2^3 + 6 = 14
c = 3^3 + 9 = 36
d = 4^3 + 12 = 76

so, c=x=36
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in a room there are 7 person,the chance that two of them were born on the same day of the week is. Proud that 0=1 (without use factorial)