How many ways can 2 boys and 3 girls be selected from a group of 5 boys and 6 gi

Practice Questions

Q1
How many ways can 2 boys and 3 girls be selected from a group of 5 boys and 6 girls?
  1. 100
  2. 60
  3. 80
  4. 120

Questions & Step-by-Step Solutions

How many ways can 2 boys and 3 girls be selected from a group of 5 boys and 6 girls?
Correct Answer: 200
  • Step 1: Identify the total number of boys and girls in the group. There are 5 boys and 6 girls.
  • Step 2: Determine how many boys we need to select. We need to select 2 boys.
  • Step 3: Use the combination formula C(n, r) to find the number of ways to choose 2 boys from 5. This is calculated as C(5, 2).
  • Step 4: Calculate C(5, 2). The formula for combinations is C(n, r) = n! / (r! * (n - r)!). So, C(5, 2) = 5! / (2! * (5 - 2)!) = 10.
  • Step 5: Now, determine how many girls we need to select. We need to select 3 girls.
  • Step 6: Use the combination formula C(n, r) to find the number of ways to choose 3 girls from 6. This is calculated as C(6, 3).
  • Step 7: Calculate C(6, 3). Using the combination formula, C(6, 3) = 6! / (3! * (6 - 3)!) = 20.
  • Step 8: Multiply the number of ways to choose the boys by the number of ways to choose the girls. This gives us the total number of ways to select 2 boys and 3 girls: 10 * 20 = 200.
  • Combination – The concept of selecting a subset of items from a larger set without regard to the order of selection.
  • Binomial Coefficient – The mathematical notation C(n, k) represents the number of ways to choose k elements from a set of n elements.
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