Question:

Mohammed is being treated to ice cream for his birthday, and he's allowed to build a three-scoop sundae from any of the 31 available flavors, with the only condition being that each of these flavors must be unique. He’s also allowed to pick 2 different toppings out of 10, but one topping (peanut butter cup pieces) is already fixed. Knowing these details, how many sundae combinations are available?

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When one option is fixed in combinations, reduce the total available choices by one, and then compute the remaining using combinations.
Updated On: Sep 30, 2025
  • 44950
  • 2427300
  • 40455
  • 202275
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The Correct Option is D

Solution and Explanation

Step 1: Choose ice cream flavors.
We need to select 3 unique flavors from 31. \[ \binom{31}{3} = \frac{31 \times 30 \times 29}{3 \times 2 \times 1} = 4495 \]
Step 2: Choose toppings.
One topping (peanut butter cup pieces) is already chosen. So, we only need to select 1 more from the remaining 9 toppings. \[ \binom{9}{1} = 9 \]
Step 3: Total combinations.
\[ \text{Total} = 4495 \times 9 = 40455 \] Wait — check carefully: If the topping count is 2 and one is fixed, we only add one more, so the calculation stands. Thus, \[ \boxed{40455} \]
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