How many necklace of 12 beads each can be made from 18 beads of different colours?
A). 18!
B). 18! x 19!
C). 18!(6 x 24)
D). 18! x 30
18!(6 x 24)
NA
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1. How many three letter computer passwords can be formed (no repetition allowed) with at least one symmetric letter ?
2. Find out the number of ways in which 6 rings of different types can be worn in 3 fingers?
3. If nc2 = nc5, find n?
4. A box contains 4 red, 3 white and 2 blue balls. Three balls are drawn at random. Find out the number of ways of selecting the balls of different colours?
5. There are 10 points in a plane out of which 4 are collinear. Find the number of triangles formed by the points as vertices.
6. How many even numbers of three digits can be formed with the digits 0, I, 2, 3, 4, 5 and 6?
7. There are 7 non-collinear points. How many triangles can be drawn by joining these points?
8. In how many ways can the letters of the word ALPHABET be arranged so that in all arrangements, the letter P takes the first position and letter E takes the last position?
9. How many 6 letter words can be formed with the letters of the word 'POLICY' such that the vowels occur only at even places.
10. 139 person have signed for an elimination tournament. All players are to be paired up for the first round but because 139 is an odd number one player gets a bye, which promotes him to the second round
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