Question

1/52+3/52+5/52+....+51/52

Answer 1

Răspuns:

S=13

Explicație pas cu pas:

S=1/52+3/52+5/52+....+51/52

S=(1+3+5+...+51)/52

Pentru S=1+3+5+...+51

1.Calculam n termeni;

n=(51-1)/2+1=25+1=26

2.Calculam suma:

S=26*(51+1)/2=13*52=676

Deci pentru:

S=(1+3+5+...+51)/52

S=676/52=13.

Bafta!