$\"\"$

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A bag placed in $\"\"$ red tiles, $\"\"$ blue tiles, $\"\"$ green tiles, $\"\"$ yellow tiles and $\"\"$ black tiles.

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Find the probability of black or yellow tiles.

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

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The probability of selecting one tile from the total number of tiles are $\"\"$ .

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Hence, $\"\"$ .

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The probability of selecting one black tiles are $\"\"$ .

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Hence, $\"\"$ .

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The probability of selecting one yellow tiles are $\"\"$ .

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Hence, $\"\"$ .

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Probability of black or yellow tiles are $\"\"$

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$\"\"$

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The probabity is $\"\"$ .

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

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$\"\"$

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The probability of black or yellow tiles is $\"\"$ . $\"\"$

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The probability of black or yellow tiles tiles is $\"\"$ .