If nP r= 720 nC r than the value r is?

More Questions from Permutation and Combination

• If S= {2, 3, 4, 5, 7, 9} , then the number of different three-digit number (with all distinct digits) less than 400 that can be formed from S is?
• If 7 points out of 12 are in the same straight line, then the number of triangles formed is?
• In how many different ways can the letters of word JUDGE be arranged so that the vowels always come together?
• From 4 officers and 8 Jawans in how many ways can 6 be chosen to include at least one officer?
• From a group of 6 men and 4 women a committee of 4 persons is to be formed?
• The numbers of straight lines can be formed out of 10 points of which 7 are collinear?
• The number of different permutations of the word 'BANANA' is?
• Everybody in a room shakes hands with everybody else. The total number of hand shakes is 66. The total number of persons in the room is?
• In how many ways can the letter of the word ' civilization' be arranged?
• Letters of the word DIRECTOR are arranged in such a way that all the vowels come together. Find out the total no. of ways for making such arrangement.?

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