If positive integer k is divided by 10, the quotient is m and the remainder is 2, then which of the following must be true?
I. k + m is even
II. k cannot be a prime number
III. k is divisible by 4 Answers.
A) None
B) I
C) II
D) III
E) I and II only
k = 10m+2 = 2(5m+1)   I. k + m = 2(5m+1) + m =&gt; even if only m is even, however m can be odd =&gt; not always true   II. k can not be a prime: not always true:   m=0 =&gt; k=2 : a prime   III. not true if m is even   Nonens: none of the above
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If positive integer k is divided by 10, the quotient is m and the remainder is 2, then which of the following must be true?
I. k + m is even
II. k cannot be a prime number
III. k is divisible by 4