The following figure has a network of re...

The following figure has a network of rectangles. Two rows and three columns.

(A) Totally how many rectangles are there in the figure?
(B) If there are x rectangles in each row and y rectangles in each column, totally how many rectangles will be there in the network, in terms of x and y.

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The correct Answer is:

`(x(x+1))/(2)xx(y(y+1))/(2)`

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