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  4. If 3x = 5 (mod 7), then

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Q. If $3x = 5 (mod 7)$, then

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Solution:

$3x =5 (mod 7) = 12 \, \, \, \, \, \, \, \, \, [\because 12=5(mod 7)] $
$x = 4 (mod 7) \therefore option $ holds