Probability Calculation involving Combinations

MathematicsCombinatorics and ProbabilityMediumYKS

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$$\frac{\binom{9}{2}}{\binom{16}{2}} + \frac{\binom{9}{1} \cdot \binom{7}{1}}{\binom{16}{2}}$$

This question includes visual content: The image displays two mathematical expressions involving binomial coefficients arranged in an addition structure. On the left is the fraction $\binom{9}{2} / \binom{16}{2}$. On the right is the fraction $(\binom{9}{1} \cdot \binom{7}{1}) / \binom{16}{2}$. A plus sign is placed between the two fractions. The annotations 'MM' and 'MK' are written above the left and right expressions respectively, with 'MM' in a circle.

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Step by Step Written Solution

1
Step 1

Merhaba Beril. Bu görselde bir olasılık problemi çözümünün başlangıç adımlarını görüyoruz. Gel bu işlemi birlikte adım adım çözelim.

Olasılık Hesabı

2
Step 2

İşlemimizde iki ana durumun toplamı var. İlk durum her iki seçimin de Mavi olması, yani M M durumu. İkinci durum ise bir Mavi ve bir Kırmızı yani M K durumudur.

$$\frac{\binom{9}{2}}{\binom{16}{2}} + \frac{\binom{9}{1} \cdot \binom{7}{1}}{\binom{16}{2}}$$
3
Step 3

Önce paydadaki on altının ikili kombinasyonunu hesaplayalım. Bu, toplam seçim sayısını verir. On altı çarpı on beş bölü iki, yani yüz yirmi eder.

$$\binom{16}{2} = \frac{16 \cdot 15}{2} = 120$$
4
Step 4

Şimdi sol taraftaki payı, yani dokuzun ikilisini bulalım. Dokuz çarpı sekiz bölü iki, otuz altı sonucunu verir.

$$\binom{9}{2} = \frac{9 \cdot 8}{2} = 36$$
5
Step 5

Sağ taraftaki payda ise dokuzun birlisi dokuz, yedinin birlisi yedidir. Dokuz kere yedi altmış üç yapar.

$$\binom{9}{1} \cdot \binom{7}{1} = 9 \cdot 7 = 63$$

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About This Question

Subject
Mathematics
Topic
Combinatorics and Probability
Difficulty
Medium
Exam
YKS

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