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Question

The LCM of (x−3)(x−5) and (x−5)(x−7) is:

A
(x3)(x5)(x7)
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B
(x3)(x5)
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C
(x3)(x7)
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D
(x5)(x7)
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Solution

The correct option is A (x3)(x5)(x7)
The irreducible factors occuring in (x3)(x5) and (x5)(x7) are (x3),(x5) and (x7)
The greatest exponents of these respectively are 1,1 and 1.
Hence, the LCM = (x3)1× (x5)1× (x7)1 = (x3)(x5)(x7).

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