$\"\"$

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A bag contains $\"\"$ red marbles, $\"\"$ blue marbles, and $\"\"$ yellow marbles.

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Find the probability of not yellow marbles.

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The total number of marbles are $\"\"$ .

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The number of ways of selecting one marble from the total number of marbles is $\"\"$ .

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Hence, $\"\"$ .

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The probability of selecting one yellow marble is $\"\"$ .

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Hence, $\"\"$ .

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The probabity is $\"\"$ .

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$\"\"$ (Substitute $\"\"$ and $\"\"$ )

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$\"\"$

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Probability of selecting not yellow is $\"\"$ .

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$\"\"$ (Substitute $\"\"$ )

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$\"\"$ (Simplify)

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The probability of not yellow marble is $\"\"$ . $\"\"$

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The probability of not yellow is $\"\"$ .