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C
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⌫
π
e
7
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\(\div\)
\(\sqrt{\,}\)
\(a^{b}\)
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\(\times\)
\(\frac{a}{b}\)
ln
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sin
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tan
tan⁻¹
You have a box with 10 balls, of which 6 are red and 4 are blue. How many different ways can you select 3 balls from the box such that exactly 2 of them are red?
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ways
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