self Maths Puzzle

There are 5 apples (same shape and size) and 3 bananas (same shape and size). How many combination can be made from these fruits?

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self Other Question

A country gives contract to 8 companies to prepare gold coins. Each gold coin should weigh 10 grams. It was later found that one of the gold coin measured 9 grams. It is known somehow that only one of the company has delivered 9 grams' gold coin. How to find that company by only measuring weight once. Assume that sufficient number of gold coins from each company is available. what is the next number?
15,28,42,58,80