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Question

Simplify 25×55.

A
105
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B
1010
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C
27
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D
105
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Solution

The correct option is D 105
We know, for non-zero integers 'a' and 'b' and any integer 'm',
am×bm=(a×b)m

Comparing the given expression 25×55 with the LHS of the above equation, we have
a = 2, b = -5 and m = -5.

25×55=(2×5)5=105

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