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Decimal Fraction - General Aptitude

Q1:

Evaluate : (2.39)2 - (1.61)2
2.39 - 1.61

A 2

B 4

C 6

D 8

ANS:B - 4

Given Expression = a2 - b2 = (a + b)(a - b) = (a + b) = (2.39 + 1.61) = 4.
a - b (a - b)