
Probleme de numărare
Authored by Anca Bereschi
Mathematics
10th Grade
Used 1+ times

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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 20 pts
Se consideră mulțimea A={0,1,2,3,4}.Numarul submulțimilor cu 2 elemente ale mulțimii A este:
120
60
10
20
2.
MULTIPLE SELECT QUESTION
45 sec • 20 pts
Care este probabilitatea ca, alegând un număr K din {0,1,2,...,7}numarul C^k/7 sa fie prim?
Care este probabilitatea ca, alegând un număr K din {0,1,2,...,7}numarul C^k/7 sa fie prim?
0,50
1/4
0,25
2/8
3.
MULTIPLE CHOICE QUESTION
30 sec • 20 pts
Să se determine probabilitatea ca,alegând un numar xy din mulțimea numerelor naturale de doua cifre ,sa avem x≠y.
0,1
81/90
0,9
80/99
4.
MULTIPLE CHOICE QUESTION
30 sec • 20 pts
A={1,2,3,4...,10}. Să se determine numarul submultimilor cu 3 elemente ale multimii A ,care îl conțin pe 1.
10
120
36
84
5.
MULTIPLE CHOICE QUESTION
30 sec • 20 pts
Se consideră mulțimea A={0,1,2,...,7}. Să se determine numarul submultimilor mulțimii A care au 2 elemente dintre care suma elementelor sa fie numar par.
10
9
30
60
6.
MULTIPLE CHOICE QUESTION
30 sec • 20 pts
Câte numere naturale de 3 cifre distincte se pot forma cu elemente ale mulțimii {2,4,6,8}?
27
30
24
10
7.
MULTIPLE CHOICE QUESTION
30 sec • 20 pts
Să se determine ca n este din multimea numerelor naturale pentru care {1,2,...,n} are exact 120 de submultimi cu doua elemente.
20
16
10
19
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