book Maths Puzzle Numerical Ability

USE THE FORMULA FOR COMBINATIONS TO SOLVE THE FOLLOWING PROBLEM. PLEASE SHOW WORK.</b>

A locker contains 8 books. You select 3 books at random. How many different sets of books could you select?

Thank you for your brain power!</b>

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Add:
3 h 20 min
4 h 25 min
+ 5 h 35 min

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Sher The combined ages of Mary and Ann are 44 years. Mary is twice as old as Ann. When Mary was half as old as Ann will be when Ann is three times as old as Mary, when Mary was three ti