Question
A. 4 cara D. 18 cara B. 6 cara E. 24 cara C.10 cara 33. Dari 10 finalis lomba AFI akan dipilih juara I,II, dan III. Banyaknya kemungkinan susunan terpilihnya sebagai juara adalah __ A C. 480 E 720 B. 240 D. 620 34. Sebuah kompetisi sepak bola Eropa "EURO"diikuti oleh 6 negara. Pada babak awal setiap negara harus bertanding satu sama lain Banyaknya pertanding- an pada babak awal adalah __ A. 36 C. 15 E 6 B. 30 D. 12 35. Sebuah kotak berisi 5 kelereng merah dan 3 kelereng kuning. Jika diambil dua kelereng secara acak satu per satu berturut-turut tanpa pengembalian, maka peluang terambil pertama kelereng merah dan kedua kelereng kuning adalah __ A. (3)/(4) (5)/(14) E (15)/(64) B. (8)/(15) D. (15)/(56)
Solution
4.1
(291 Votos)
Tatiana
Veterano · Tutor por 10 anos
Resposta
Let's solve each question one by one:**33. Selecting winners from 10 finalists:**To determine the number of possible arrangements for selecting a winner for positions I, II, and III from 10 finalists, we use permutations because the order matters.The formula for permutations is given by:
Where
is the total number of items to choose from, and
is the number of items to choose.Here,
and
.
So, the number of possible arrangements is **720**.**Answer: E. 720**---**34. Number of matches in a round-robin tournament with 6 teams:**In a round-robin tournament, each team plays every other team exactly once. The number of matches can be calculated using combinations since the order of matches does not matter.The formula for combinations is:
Where
is the number of teams.For 6 teams:
So, there are **15** matches in the initial round.**Answer: C. 15**---**35. Probability of drawing a red marble first and a yellow marble second without replacement:**First, calculate the probability of drawing a red marble first. There are 5 red marbles out of a total of 8 marbles.Probability of first red marble:
After drawing a red marble, there are now 4 red marbles and 3 yellow marbles left, making a total of 7 marbles.Probability of second yellow marble:
The combined probability of both events happening in sequence is:
So, the probability is
.**Answer: D.
**