Question
Among a set of 6 black balls and 3 white balls, how many
selections of 5 balls can be made such that at least 3 of them are black balls?Solution
Selecting at least 3 black balls from a set of 6 black balls in total selection of 5 balls can be 3 black and 2 white balls 4 black and 1 white balls 5 black and 0 white balls Therefore, our solution expression looks 6C3 × 3C2 + 6C4 × 3C1 + 6C5 × 3C0 = 20 × 3 + 15 × 3 + 6 × 1 = 60 + 45 + 6 = 111 ways
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ONDANSETRON
From the given options, select the word which cannot be formed using the letters of the word 'ADVERTISEMENT' only once.
In the following question, a group of letters is given which are numbered 1, 2, 3, 4, 5 and 6. Below are given four alternatives containing combinatio...
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CONFIRMATIONFind which one of the given words can be made from the letters of the given word.
‘ SMARTLY ’
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TRANSFORMER
Word I: FORMAT
Word II: REFORM
Word III: REMOTE
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From the given alternatives select the word which cannot be formed using the letters of the given word
SECULARIZATION
Which among the following words cannot be formed using the letters of the given word only once?
DETERMINATION
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