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14.There are (n-1) red balls, n green balls and(n+1)blue balls, in a bag. The number of ways of choosing two balls from the bag that have different colours is 299.what is the value of n? |
| Answer» 14.There are (n-1) red balls, n green balls and(n+1)blue balls, in a bag. The number of ways of choosing two balls from the bag that have different colours is 299.what is the value of n? | |