Mathematics: What is the value of ? a. 7.5 b. 17.5 c. 60.5 d. 76.5

What is the value of ? a. 7.5 b. 17.5 c. 60.5 d. - id75175605763965881, bikerhomie

Ответ:

Aidanjsauer

11.01.2022

Mathematics

76.5

Step-by-step explanation:

Recall that for any positive integer n

n! = 1*2*3*4*...*n

For example

5! = 1*2*3*4*5 = 120

$\sum_{n=2}^6\frac{(n-1)!}{2}=\frac{(2-1)!}{2}+\frac{(3-1)!}{2}+\frac{(4-1)!}{2}+\frac{(5-1)!}{2}+\frac{(6-1)!}{2}=\\\\=\frac{1!}{2}+\frac{2!}{2}+\frac{3!}{2}+\frac{4!}{2}+\frac{5!}{2}=\frac{1}{2}+\frac{1*2}{2}+\frac{1*2*3}{2}+\frac{1*2*3*4}{2}+\frac{1*2*3*4*5}{2}=\\\\=\frac{1}{2}+1+3+12+60=\boxed{76.5}$

0,0(0 оценок)

Ответ:

benwill0702

23.01.2022

Mathematics

4,2 is part of 8,4

Step-by-step explanation:

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What is the value of ? a. 7.5 b. 17.5 c. 60.5 d. 76.5

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