If m and n are non-zero integers, is m^n an integer?
(1) m < 0
(2) nm is an integer.
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If x and y are positive integers, is the sum x + y divisible by 4 ?
(1) When the sum 23x + 25y is divided by 10, the remainder is 8.
(2) When 22y is divided by 10, the remainder is 8.
If x and y are positive integers and x is even, is xa + yb = even
1) y is odd
2) a! = b!
If a is an integer, what is the units digit of a18?
(1) a2 has a units digit of 9
(2) a7 has a units digit of 3
If m and n are positive integers greater than 1, is m + n odd?
(1) m is a divisor of 16
(2) The units digit of 12m + 28n is 6.
If a and b are positive integers, what is the digit at the unit's place of 18^(2a + 5b)?
(1) a is even, b is a multiple of four.
(2) b = 12
If the integers a and n are greater than 1 and the product of the first 8 positive integers is a multiple of an, what is the value of a ?
(1) an = 64
(2) n=6
A, B, C and D are positive integers such that A/B = C/D. Is C divisible by 5?
(1) A is divisible by 210
(2) B = 7x, where x is a positive integer
If k is an integer greater than 1, is k equal to 2r for some positive integer r?
(1) k is divisible by 26.
(2) k is not divisible by any odd integer greater than 1.