Friday, April 2, 2010

Problem # 2

Number 14 was my favorite question.
14) The sum of the digits of a five-digit positive ineger is 2. (A five-digit integer cannot start with zero.) Th enumber of such integers is:
a)1 b)2 c)3 d)4 e)5

Well i thought to myself, what could be added that equals to 2? "1 and or 2 with 0's"
Than I proceeded to write down all the possibilities. (keeping in mind that the number could not start with 0):

11000
10100
10010
10001
20000

therefore there is 5! (answer is e)
I like this question because i like questions that are straightforward, and you dont' have to think outside the box for ways to solve the problem. ^^

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