fozzzy wrote:
If m and n are positive integers and r is the remained when 5(10^n) + m is divided by 3, what is the value of r?
1) n=10
2) m=1
5*(10^n) + m
eg. of this expression will be
50 + m
500 + m
5000 + m
etc
When you divide 50 or 500 or 5000 etc by 3, the remainder will always be 2 (the remainder will be the same as that obtained when you divide the sum of the digits by the numbers by 3 i.e. Sum of digits of 5000 = 5+0+0+0 = 5. When you divide 5 by 3, the remainder is 2. When you divide 5000 by 3, the remainder will be 2 only)
So the remainder when 5*(10^n) + m is divided by is dependent on the value of m.
Statement 2 tells us that m = 1.
So when 5*(10^n) + m is divided by 3, the remainder will be 0 (Remainder when 51 or 501 or 5001 is divided by 3 will be 0).
Answer (B)
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Karishma
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