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Question

The value of limn 45n+123n63n+1+5n is

A
20
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B
20
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C
1
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D
does not exist
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Solution

The correct option is B 20
limn 45n+123n63n+1+5n

=limn 205n23n183n+5n

Dividing numerator and denominator by 5n, we get
limn 202(35)n18(35)n+1=201=20

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