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What does n! (n factorial) represent?

• The sum of the first n natural numbers.

• The product of the first n natural numbers.

• The sum of all natural numbers up to n.

• The product of all natural numbers up to n, excluding zero.

In a scenario where 40 ripe watermelons are available and 2 are chosen, how many ways can 2 ripe watermelons be selected?

• 780

• 1225

• 40

• 2

cate tipuri de probleme de probabilitate exista

• Tipuri de probleme de probabilitate includ: teoretică, experimentală, condiționată, combinatorică și continuă.
• probleme de aritmetica
• probleme de geometrie
• probleme de algebra

If there are 50 watermelons in total and 2 are chosen, how many different pairs of watermelons can be selected?

• 780

• 1225

• 156

• 245

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• Da

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In a lottery with 100 tickets, 10 tickets win 200 lei each, and 20 tickets win 100 lei each. How many tickets win no prize?

• 10

• 20

• 70

• 30

In a lottery with 100 tickets, where 10 tickets win 200 lei, 20 tickets win 100 lei, and 70 tickets win 0 lei, how many ways are there to select two tickets that result in a total win of exactly 200 lei?

• 190

• 700

• 890

• 4950