{ \left( { C }_{ 3 } \right) }^{ 15 }
Differentiate w.r.t. C_3
15C_{3}^{14}
Evaluate
C_{3}^{15}
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15C_{3}^{15-1}
The derivative of ax^{n} is nax^{n-1}.
15C_{3}^{14}
Subtract 1 from 15.
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