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What is the remainder when the positive integer n is divided

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What is the remainder when the positive integer n is divided [#permalink] New post 03 Aug 2005, 06:35
What is the remainder when the positive integer n is divided by 3?

1) The remainder when n is divided by 2 is 1
2.) The remainder when n+1 is divided by 3 is 2


plz why b is sufficient thanks
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 [#permalink] New post 03 Aug 2005, 07:12
n+1=3k+2

==>n=3k+1 ==> rem is 1
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 [#permalink] New post 03 Aug 2005, 07:18
Stmt 1 is insufficient because n = 2k + 1 means n is odd. However we cannot conclude the remainder when n is divided by 3 simply by knowing n is odd. E.g. if n = 5, 5/3 = 2. if n = 7, 7/3 = 1. So insuff

Stmt 2 says n + 1 = 3k + 2; n = 3k + 1
This tells us the remainder when n is divided by 3 = 1
so sufficient
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 [#permalink] New post 03 Aug 2005, 16:26
B

1) The remainder when n is divided by 2 is 1

=> we know n is an odd number, but cannot decide what will be remainder
after divided by 3

2.) The remainder when n+1 is divided by 3 is 2

=> from n+1 divided by 3, remainder is 2, we know n has to be: 3K+1, therefore remainder is 1

==========
What is the remainder of -2 divided by 3 ?
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 [#permalink] New post 03 Aug 2005, 17:07
From conditon 1 n = 2x+1 insufficient

From COnditon 2 n = 3y + 5 , surely not divisible by 3.
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 [#permalink] New post 03 Aug 2005, 17:09
qpoo wrote:
B

1) The remainder when n is divided by 2 is 1

=> we know n is an odd number, but cannot decide what will be remainder
after divided by 3

2.) The remainder when n+1 is divided by 3 is 2

=> from n+1 divided by 3, remainder is 2, we know n has to be: 3K+1, therefore remainder is 1

==========
What is the remainder of -2 divided by 3 ?


We get reminder of -2, -2 = (3*0)-2
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 [#permalink] New post 03 Aug 2005, 17:34
thanks ranga,

the remainder of -2 divided by 3, can I also say:


We get reminder of 1, -2 = (-1*3)+1 ?

I guess it depends on if we allow remainder to be negative.
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 [#permalink] New post 03 Aug 2005, 18:29
qpoo wrote:
thanks ranga,

the remainder of -2 divided by 3, can I also say:


We get reminder of 1, -2 = (-1*3)+1 ?

I guess it depends on if we allow remainder to be negative.


Two reminders for one division...You got me there..
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 [#permalink] New post 06 Aug 2005, 22:39
The remainder of -2 divided by 3 is 1.

Remainders should be 0<= r <= q-1

for a = bq + r
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 [#permalink] New post 07 Aug 2005, 03:46
B. 2nd condition is sufficient.
The question specifically asks for positive integer n

Vik
  [#permalink] 07 Aug 2005, 03:46
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