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Question

If limxa x5a5xa=405, then the possible value(s) of 'a' is/are

A
2
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B
-2
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C
3
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D
-3
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Solution

The correct option is D -3
limxa x5a5xa=405limxaxnanxa=nan1Therefore,5×a51 = 34×5 = (3)4×5a=3 or a=3

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