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How many bowls of picnic sides for 30 people?

The number of bowls of picnic sides needed for 30 people will depend on the specific sides being served and portion sizes. A general guideline is to plan for about 1 cup of side dish per person, which translates to approximately 30 cups total. If you're serving multiple side dishes, you might consider having 2-3 bowls of each type, depending on the variety and preferences of your guests.


In how many ways can you choose 2 side dishes out of 9?

There are 36 possible combinations.


How many two thirds cup cereal bowls can be filled from 10 cups of cornflakes?

10 cups is thirty "third-cups". so 30/2 ie 15 "two-third" cups.


How many combinations are there in 39 numbers?

It depends on how many numbers are in each combination. If there are 5 numbers in each combination, then you have 575,757 possibilities. If there are 2 in each combination, there you have 741 possibilities. If there's only 1 number in each combination, then there are only 39 possibilities.


How many ways can you choose 2 side dishes out of 9?

Assuming you want 2 different side dishes, they can be chosen in 9 × 8 ways, but as the order doesn't matter every combination has been chosen twice so that there are 9 × 8 ÷ 2 = 36 difference choices. There is a general formula for choosing r different items from a set of n items: nCr(n, r) = n!/(r!(n-r)!) where the exclamation mark means "factorial", which is n × (n-1) × (n-2) × ... × 2 × 1. eg 4! = 4 × 3 × 2 × 1 = 24. 0! is defined to be 1. For 2 items from 9 this gives: nCr(9, 2) = 9!/(2!(9-2)!) = 9!/(2!7!) = (9 × 8 × 7 × 6 × ... × 1)/((2 × 1) × (7 × 6 × ... × 1)) = (9 × 8)/2 = 36 (as before).