Question

Calcule 
₈
∑ (8/k)
k=1


₇
∑ (7/p)
p=2

Answer 1

Boa noite Rodrigo 

a)

C(8,1) + C(8,2) + C(8,3) + C(8,4) + C(8,5) + C(8,6) + C(8,7) + C(8,8) 

8
∑ C(8,k) = 2^8 = 256
0 

8
∑ C(8,k) = 2^8 = 256 - C(8,0) = 256 - 1 = 255
1 


B) 

7
∑ C(7,p) = 2^7 = 128 - C(7,1) - C(7,0) = 128 - 7 - 1 = 120 
2