NUMERIC RESPONSE
A box contains two white balls, three black balls and four red balls. The number of ways such that three balls can be drawn from the box if at least one black ball is to be included in the draw is
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NUMERIC RESPONSE
(64) A selection of 3 balls so as to include at least one black ball, can be made in the following 3 mutually exclusive ways
(i) 1 black ball and 2 others 
(ii) 2 black balls and one other 
(iii) 3 black balls and no other 
Total number of ways 
.
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