If a- b3 = 513 and a - b =3, what is the value of ab?

A 54

B 35

C 45

D 55

Solution

Correct Answer: Option A

দেওয়া আছে, 
a³ - b³ = 513
a - b = 3

আমরা জানি,
(a - b)³ = a³ - b³ - 3ab(a - b) 
বা, 3³ = 513 - 3ab(3)
বা, 27 = 513 - 9ab
বা, 9ab = 513 - 27
বা, 9ab = 486
বা, ab = 486/9
বা, ab = 54 

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