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Muskan Tanwar

· started a discussion

· 1 Months ago

problem (Question: 191602.0 )

plz update another trick. i didnt get it

Question:
When a positive integer n is divided by 5, the remainder is 2.What is the remainder when the number 3n is divided by 5 ?   
Options:
A) 1
B) 2
C) 3
D) 5
Solution:
Ans: (a) Let number n=5a + 2 

3n=15a + 6, now we represent as a multiple of 3 

3n= 3(5a+1)+2 

Now, Comparing  the unknown Number Part,

              5a+2   for remainder is 2

      Thus  (5a+1)   remainder is 1

So, when 3n is divided by 5 then remainder will be 1. 

Akhilesh Chand

· commented

· 1 Months ago

let n=2 so that when 2 is divided by 5 remainder is 2. now 3n=6 so 6 divided by 5 gives 1 as remainder.
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