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Demonstrați că
a) (2n+3,5n+7)=1
b) (n+3,2n+7)=1
c) (4n+5,5n+6)=1
d) (2n+1,3n+2)=1
e) (5n+6,6n+7)=1
f) (3n+4,5n+7)=1

Pls
COROANA