Question
A box contains 7 red, 6 white and 4 black balls. How many selections of 3 balls can be made so that (a) all there
A box contains 7 red, 6 white and 4 black balls. How many selections of 3 balls can be made so that (a) all there are red balls, (b) none is red ball and (c) there is one ball of each colour?
In how many different ways, can 9 men be selected from 15 men so as to always (a) include 3 particular men and (b) exclude 3 particular men?
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Professional Android 4 Application Development
Authors: Reto Meier
3rd Edition
1118223853, 9781118223857
