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26 May, 17:31

Geico has seven colors of lanyard she is the three different colors to make a key chain how many different combinations can she choose

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  1. 26 May, 17:54
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    Combination = doesn't matter what order

    Permutation = order matters

    There are two methods to work out combinations.

    Method 1 List out possibilities

    123 124 125 126 127 134 135 136 137 145 146 147 156 157 167

    234 235 236 237 245 246 247 256 257 267

    345 346 347 356 357 367

    456 457 467

    567

    For a total of 35 combinations.

    Method 2 Use a formula.

    It's a rather complicated one, so only use it if you have a lot of possibilities.

    (n is the number of choices, r is the amount you choose, and! is a function that multiplies together all numbers down to 1)
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