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Question

Find the value of:
4.2 x 4.2 - 1.9 x 1.9   2.3 x 6.1

Options:
A .  0.5
B .  1
C .  20
D .  22
E .  None of these
Answer: Option B
 -   Given Expression = (a2 - b2) = (a2 - b2) = 1. (a + b)(a - b) (a2 - b2)

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