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if the probablity of the guess is 1/3
prob of copying is 1/8
prob of copying which is the right is 1/8
so what is the probablity of geetting the answer right abd he knows that answer is right?

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TCS Other Question

At the end of 1994 rohit was half old as his grandmother the sum of years on which they born is 3844 how old rohit is at the end of 1994 If A, X, Y, and Z are unique nonzero digits in the equation: XY* YX= AYZ And Y > X, the 2-digit number XY = ?
a)13
b)21
c)23
d)24