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What is the value of abcd + a + b + c + d ?
(1) a2 + b2 + c2 + d = 249
(2) d > = 249
The symbol Ω represents one of the following operations: addition, subtraction, multiplication or division. What is the value of 1 Ω 1?
(1) 2 Ω 2 = 4
(2) 0 Ω 1 = 0
What is the value of y?
(1) x2 - y2 = 5
(2) x and y are each positive integers
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