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If a < b and c > d, which of the following must be true?

 
a - c > b - d
a + c < b + d
a - c < b - d
a - b > c - d

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Arn=a-b<0
rndrn=0rn
rna-b<0rn=a-brn=a-crn
rnHope it\'s correct..

Please explain these...i am not clarified with the answer given below