a box contains 6 difference white balls and 5 different red balls in how many ways can 6 balls be selected so there are at least two balls of each colour
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for selecting 6 balls so that atleast two balls of each colours = 5c2*6c4 + 5c3*6c3 + 5c4*6c2
= 10*15 + 10*20 + 5*15
=150 + 200 + 75
= 425
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