Evaluate
10\left(C_{2}+2C_{3}+C_{4}\right)
Factor
10\left(C_{2}+2C_{3}+C_{4}\right)
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10C_{2}+20C_{3}+10C_{4}
Multiply 2 and 10 to get 20.
10\left(C_{2}+2C_{3}+C_{4}\right)
Factor out 10.
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