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 A box contain two white balls, three black balls and 4 red balls. In how many ways can three balls be drawn from the box, if at least one black ball is to be included in the draw is:
  • a)
    36
  • b)
    64
  • c)
    79
  • d)
    none
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
A box contain two white balls, three black balls and 4 red balls. In h...
2W, 3B, 4R
1st method 
At least one black ball out of 3 ball

= 84 - 20 = 64
2nd method
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Most Upvoted Answer
A box contain two white balls, three black balls and 4 red balls. In h...
2W, 3B, 4R
1st method 
At least one black ball out of 3 ball

= 84 - 20 = 64
2nd method
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A box contain two white balls, three black balls and 4 red balls. In how many ways can three balls be drawn from the box, if at least one black ball is to be included in the draw is:a)36b)64c)79d)noneCorrect answer is option 'B'. Can you explain this answer?
Question Description
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