Seven white balls and three black balls ...

Seven white balls and three black balls are randomly placed in a row. The probability that no two black balls are placed adjacently equals a.`1//2` b. `7//15` c. `2//15` d. 1/3

A

`(1)/(2)`

B

`(7)/(20)`

C

`(2)/(15)`

D

`(1)/(3)`

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The correct Answer is:

(b)

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