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The average of 3 numbers is X. If the average of first 2 numbers is Y and the average oflast 2 numbers is Z , what is the second number?

A. 2Y + 2Z -3X
B. 3X -Y -Z
C. 2 Y +2Z +3x
D. X-Y-Z
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সঠিক উত্তরঃ A. 2Y + 2Z -3X
Explanation: