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No, these questions from a maths textbook that I'm asking aren't the hardest you'll ever try but I'll (semi) admit defeat and ask for help from GTP's denizens.
Firstly:
How many different symbols will be needed so that at least 1 million different three-symbol arrangements can be made?
And secondly:
Four students are going to be chosen, from a group of 10, to represent their school at a conference. Only one of Aziz, Baz or Chris is to be included. In how many ways can the students be chosen?
Firstly:
How many different symbols will be needed so that at least 1 million different three-symbol arrangements can be made?
And secondly:
Four students are going to be chosen, from a group of 10, to represent their school at a conference. Only one of Aziz, Baz or Chris is to be included. In how many ways can the students be chosen?