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A={x1,x2,x3,x4,x5},B={y1,y2,y3,y4,y5}. A...

`A={x_1,x_2,x_3,x_4,x_5},B={y_1,y_2,y_3,y_4,y_5}.` A one-one mapping is selected at random from the set of mapping from A to B, the probability that it satisfies the condition `f(x_1)!= y_1,i=1,2,3,4,5` is

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