Arithmetic 20153

The teacher has 12 examples from geometry and 15 examples from arithmetic. How many papers can he create if he wants three examples from geometry and five from arithmetic in the letter?

Correct answer:

n =  660660

Step-by-step explanation:

C3(12)=(312)=3!(123)!12!=321121110=220  C5(15)=(515)=5!(155)!15!=543211514131211=3003  n=(312) (515)=220 3003=660660

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