book Maths Puzzle Numerical Ability

Can someone please answer the question 2700, that is already on your site.

Thank yuou very much!

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book Other Question

I know all the answers to these problems but i do not understand how to write the equations to them.
Suppose you are selling stuffed animals for $6 each. You sold six more rabb Assume that we have ten people. Find the probability that at least two of ten people were born on the same day of the year.