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Let A = {x1, x2, x3, ,x7},B={y1, y2, y3...

Let `A = {x_1, x_2, x_3, ,x_7},B={y_1, y_2, y_3}` The total number of functions `f: A->B` that are onto and there are exactly three element `x` in A such that `f(x)=y_2` is equal to a. `490` b. `510` c. `630` d. none of these

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