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奇偶性   題數(shù)：20
Is the integer n odd?(1) n is divisible by 3.(2) 2n is divisible by twice as many positive integers as n.
If x and y are integers, is y an even integer?(1) 2y – x = x2 – y2(2) x is an odd integer.
If n and k are positive integers, is n/k an even integer?(1) n is divisible by 8.(2) k is divisible by 4.
Lists S and T consist of the same number of positive integers. Is the median of the integers in S greater than the average (arithmetic mean) of the integers in T?(1) The integers in S are consecutive even integers, and the integers in T are consecutive odd integers.(2) The sum of the integers in S is greater than the sum of the integers in T.
If r, s, and t are positive integers, is r + s + t even?(1) r + s is even.(2) s + t is even.
If n is an integer, is n even?(1) n2 -1 is an odd integer.(2) 3n + 4 is an even integer.
If k, m, and p are integers, is k – m – p odd?(1) k and m are even and p is odd.(2) k, m, and p are consecutive integers.
Is the integer n even?(1) n – 5 is an odd integer.(2) n/5 is an even integer.
If i and j are integers, is i+j an even integer?(1) i<10(2) i = j
Is x an odd integer?(1) x + 3 is an even integer.(2) x/3 is an odd integer.
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