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Question

If the operation is defined by xy=xy for all positive numbers x and y, then (545)60=

A
30
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B
60
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C
90
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D
3015
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E
6015
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Solution

The correct option is B 30
(545)
5×45 = 15
So, (545)60 $ =
1560 = 15×60 =30
Option A is the correct answer.

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