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A box contains 7 red, 6 white and 4 blue balls. How many selection of three balls can be made so that all three are red balls?

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Important Questions on Permutations & Combinations

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Quantum CAT Also Useful for XAT>Chapter 19 - SNAP>CMAT>Q 45
In the previous question (no. 44) if the red coloured ball is not taken, then the number of selections is:
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Quantum CAT Also Useful for XAT>Chapter 19 - SNAP>CMAT>Q 46
In the question (no. 44), if there is one ball of each colour, then the number of selections is :
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Quantum CAT Also Useful for XAT>Chapter 19 - SNAP>CMAT>Q 47
A box contains 5 different red and 6 different white balls. In how many ways can 6 balls be selected so that there are at least two balls of each colour
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Quantum CAT Also Useful for XAT>Chapter 19 - SNAP>CMAT>Q 48
Find the number of different words that can be formed from 15 consonants and 5 vowels by taking 2 consonants and 4 vowels in each word.
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Quantum CAT Also Useful for XAT>Chapter 19 - SNAP>CMAT>Q 49
Find the number of ways of selecting 4 letters from the word EXAMINATION.
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Quantum CAT Also Useful for XAT>Chapter 19 - SNAP>CMAT>Q 50
How many words can be formed by using 4 letters at a time out of the letters of the word MATHEMATICS?
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Quantum CAT Also Useful for XAT>Chapter 19 - SNAP>CMAT>Q 51
In how many ways can 3 ladies and 3 gentlemen be seated at a round table, so that any two and only two of ladies sit together?
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Quantum CAT Also Useful for XAT>Chapter 19 - SNAP>CMAT>Q 52
Eighteen guests have to be seated half on each side of a long table. Four particular guests desire to sit on one particular side and three others on other side. Determine the number of ways in which the sitting, arrangements can be made.