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Find the total number of selections of a...

Find the total number of selections of at least one red ball from a bag containing 4 red balls and 5 black balls, balls of the same colour being identical.

Text Solution

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Total number of selection `= [(4 + 1) (5 + 1) - 1]-5`
`= (5 xx 6 - 1)-5`
`=(30 - 1)-5=24`
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