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There are 6 contestants for the post of chairman secretary and treasurer. These positions can be filled by any of the 6. Find the possible no. of ways whether the 3 positions may be filled.
Solution
Chairman Secretary Treasurer
6 5 4
Hence the no of ways of filing the three positions is 6 x 5 x 4 = 120
6P3 = (6!)/((6 - 3)! )
= (6 * 5 * 4 * 3 * 2 * 1) /(3 * 2 * 1)
= 720/6
= 120
Properties of Dot Product u → • (v → + w → ) = u → • v → + u → • w → (cv → ) • w → = v → •(cw → ) = c (v → •w → ) v → • w → = w → • v →
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