There are two red, two blue, two white and certain number (greater than 0 ) of green socks in a ...

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There are two red, two blue, two white and certain number (greater than 0 ) of green socks in a drawer. If two socks are taken at random from the drawer without replacement, the probability that they are of the same colour is \( 1 / 5 \) then the number of green socks is
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