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Let us suppose number of right answer = x
number of wrong answer = y
x +y = 50
and , 2x - y = 76
adding both equations, we get,
x +y +  2x - y = 50 +76
⇒3x = 126
⇒x =126/3 =42
then , y = 50 - 42 =8
so, number of correct answer is 42 and number of wrong answers is 8

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