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There are counters available in x different colors. The counters are all alike except for th color. The total no of arrangements consisting of y counters, assuming sufficient no. of counters of each color, if no arrangemaent consists of all counters of the same color is?
Dear jee king
first counter can be selected in x way
second counter can be selected in x ways
.
. yth counter can be selected in x ways
total ways =xy
but it is also include that case in which all the counter are of same colour
so total posible selection = xy-x
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