
Probleme de numărare
Authored by Nicoleta Stancu
Mathematics
10th Grade
Used 22+ times

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10 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A={1,2,3,4,...,10}. Să se determine numărul submulțimilor cu 3 elemente ale mulțimii A, care îl conțin pe 1.
120
84
36
10
2.
MULTIPLE SELECT QUESTION
2 mins • 1 pt
0,9
0,1
Answer explanation
90-9=81 numere cu cifre diferite
3.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
Să se determine probabilitatea ca, alegând un număr din mulțimea numerelor naturale de 3 cifre, acesta să aibă exact 2 cifre egale
0,27
0,30
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
4
16
64
8
5.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
Câte numere naturale de 3 cifre distincte se pot forma cu elemente ale mulțimii {2,4,6,8}
2!
4 !
20
24
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
12
16
10
20
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Câte numere naturale de 4 cifre distincte se pot forma cu cifre din mulțimea {1,3,5,7,9} ?
100
120
110
105
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