If x is a positive integer, is the remainder 0 when 3x + 1 is divided by 10?
(1) x = 4n + 2, where n is a positive integer.
(2) x > 4
can i get answer to this question please??
This question is asking if 3x+1/10 is an integer.
Looking at the +1 part, this tells us that the only way it is divisible by 10 is if 3x has a 9 in the units place (9+1 =10)
3 times X has to have a 9 in the units place --> x has to have a 3 in the units place (ie 13,23,33,43, etc)
1. This tells us x is even, so it cannot have a 3 in the units place
2. Doesnt help us at all, could be 13 which would satisfy equation or could be 6 which wouldnt
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