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Decimal Fraction - General Aptitude

Q1:

4.2 x 4.2 - 1.9 x 1.9 is equal to:
2.3 x 6.1

A 0.5

B 1.0

C 20

D 22

ANS:B - 1.0

Given Expression = (a2 - b2) = (a2 - b2) = 1.
(a + b)(a - b) (a2 - b2)