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Question
The probability a red marble selected at random from a jar containing p red, q blue and r green marbles is
Options
`"q"/("p" + "q" + "r")`
`"p"/("p" + "q" + "r")`
`("p" + "q")/("p" + "q" + "r")`
`("p" + "r")/("p" + "q" + "r")`
Solution
`"q"/("p" + "q" + "r")`
Explanation;
Hint:
Sample spaces = p + q + r
Let A be the event of getting red
n(A) = p
P(A) = `"q"/("p" + "q" + "r")`
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