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A random varible X has its range :1,2,3}...

A random varible X has its range :1,2,3}. If `P(X=1)=c, P(X=2)=3c,P(X=3)=5c,` then c=

A

`1//9`

B

`2//9`

C

`3//9`

D

`1//6`

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A
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