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There are 10 people on a basketball team, and the coach needs to choose 5 to put into a game. How many different possible ways can the coach choose a team of 5 if each person has an equal chance of being selected?
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There are 1010 people on a basketball team, and the coach needs to choose 55 to put into a game. How many different possible ways can the coach choose a team of 55 if each person has an equal chance of being selected?\newlineAnswer:

Full solution

Q. There are 1010 people on a basketball team, and the coach needs to choose 55 to put into a game. How many different possible ways can the coach choose a team of 55 if each person has an equal chance of being selected?\newlineAnswer:
  1. Calculate Combinations Formula: To solve this problem, we need to calculate the number of combinations of 1010 people taken 55 at a time. The formula for combinations is given by:\newlineC(n,k)=n!k!(nk)!C(n, k) = \frac{n!}{k! \cdot (n - k)!}\newlinewhere nn is the total number of items, kk is the number of items to choose, and !! denotes factorial.\newlineIn this case, n=10n = 10 and k=5k = 5.
  2. Calculate Factorial of n: First, we calculate the factorial of nn, which is 10!10!.10!=10×9×8×7×6×5×4×3×2×110! = 10 \times 9 \times 8 \times 7 \times 6 \times 5 \times 4 \times 3 \times 2 \times 1
  3. Calculate Factorial of kk: Next, we calculate the factorial of kk, which is 5!5!.5!=5×4×3×2×15! = 5 \times 4 \times 3 \times 2 \times 1
  4. Calculate Factorial of nkn - k: We also need to calculate the factorial of nkn - k, which is 105=510 - 5 = 5, so we need 5!5! again.\newlineSince we've already calculated 5!5!, we can use the same value.
  5. Plug Values into Formula: Now we can plug these values into the combinations formula:\newlineC(10,5)=10!5!×(105)!C(10, 5) = \frac{10!}{5! \times (10 - 5)!}\newlineC(10,5)=10!5!×5!C(10, 5) = \frac{10!}{5! \times 5!}
  6. Substitute Factorial Values: Substitute the factorial values we've calculated into the formula:\newlineC(10,5)=10×9×8×7×6×5×4×3×2×1(5×4×3×2×1)×(5×4×3×2×1)C(10, 5) = \frac{10 \times 9 \times 8 \times 7 \times 6 \times 5 \times 4 \times 3 \times 2 \times 1}{(5 \times 4 \times 3 \times 2 \times 1) \times (5 \times 4 \times 3 \times 2 \times 1)}
  7. Simplify Expression: We can simplify the expression by canceling out the common factors in the numerator and the denominator:\newlineC(10,5)=10×9×8×7×65×4×3×2×1C(10, 5) = \frac{10 \times 9 \times 8 \times 7 \times 6}{5 \times 4 \times 3 \times 2 \times 1}
  8. Further Simplification: Further simplification gives us:\newlineC(10,5)=105×91×84×71×62C(10, 5) = \frac{10}{5} \times \frac{9}{1} \times \frac{8}{4} \times \frac{7}{1} \times \frac{6}{2}\newlineC(10,5)=2×9×2×7×3C(10, 5) = 2 \times 9 \times 2 \times 7 \times 3
  9. Multiply to Get Result: Multiplying these together, we get:\newlineC(10,5)=2×9×2×7×3C(10, 5) = 2 \times 9 \times 2 \times 7 \times 3\newlineC(10,5)=18×14×3C(10, 5) = 18 \times 14 \times 3\newlineC(10,5)=252×3C(10, 5) = 252 \times 3\newlineC(10,5)=756C(10, 5) = 756

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