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Question

The number 4n+15n−1 is a multiple of 9 for any natural n.

A
True
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B
False
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Solution

The correct option is A True
P(n):4n+15n1 is a multiple of 9 for any natural number n.
4n can be written as (1+3)n whose binomial expansion gives :
1+3n+9(nC2)+........+3n+15n1
which reduces to :
18n+9(nC2)+........+3n=9k
where k is an integer.
Therefore, 4n+15n1 is divisible by 9.

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