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MANISH GUPTA

· started a discussion

· 1 Months ago

n can be 0 (Question: 109781.0 )

here it is not mentioned that n is natural number so we can put n equal to 0

Question:

Find the greatest number by which the expression 72n - 32n is always exactly divisible , n is natural number

Options:
A) 4
B) 10
C) 20
D) 40
Solution:
Ans:(d) If n=1  then 72 - 32  =40, so the value of given expression will always be a multiple of 40.i.e. the number is always divisible by 40.

72n - 32n  is always divisible by 49 - 9 = 40

Knowledge Expert

· commented

· 1 Months ago

Dear Student,
From options it is clear that we will use n=1.

Thanks and Regards
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