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Ankur Singh

· started a discussion

· 1 Months ago

Don't just copy and paste. (Question: 109781.0 )

Dear expert before you reply just make sure if the ans is correct because some time it may be the ans which you have is wrong and you just copy that here because you are making our concept and if any one question got repeated in ssc mains and we marked the one you told rather than one which we thought is right then our 2.5 marks are gone and you know very well what that mean for us .

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

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