Gate Exam

what is about ies

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Gate Other Question

Given digits 2,2,3,3,4,4,4,4 how many distinct 4 digit numbers greater than 3000 can be formed? In ram's house there was a basket full of balls.The basket has a number of balls which are coloured, with equal numbers of each color. One day, his uncle shyam came and gave him 20 balls of a new colour. Adding 20 balls of a new color to the basket would not change the probability of drawing (without replacement) two balls of the same color.

How many balls are in the urn originally?