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soldi70 [24.7K]
3 years ago
9

73. If R, S, and T are integers and R + S and

Mathematics
1 answer:
Vlad [161]3 years ago
3 0
R+S is odd==>R+S=2n+1 (1)
T-S is odd ==>T-S=2k+1 (2)
(1)+(2)==>R+T+S-S=2n+1+2k+1
==>R+T=2(n+k+1) is even

Answer  A


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