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Ankur Singh

· started a discussion

· 1 Months ago

Don,t just paste (Question: 109781.0 )

So if you are not sure after our replies that which one is correct then just use your conscience and tell us you are not sure thats ok with us but its humble request dont just reply the one which is printed.If you are sure that the one which you given us is correct and we will get our marks in ssc mains then good. I am not going to suggest you this one more time because it takes time to clear a concept and if you ruin one that cost us alot and if it happens then neither we will take any of your test pack neither suggest our brother or sisters to buy one and if you are not and authority then convey this massage to your authority. If possible then make a whatsapp group to discuss this type of question with a teacher in group so that he can check that we are right or not in solving a question.Thanks for your hard work.

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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