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The probability distribution P(x) of a r...

The probability distribution P(x) of a random variable X is given by `p(X=x)={(K,when x=0),(2K,when x=1),(3K, when x=2),(0,elsewhere):}`,where K is a constant. The value of K is

A

`1/2`

B

`1/4`

C

`1/5`

D

`1/6`

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