Numbers and letters
This task is about combinations.
Issa was arranging letters and numbers in different combinations.
She found that the letters a and b can only be combined in two ways, ab and ba,
but if there were three letters, she could combine them in six different ways.
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a) Write down all the different ways Issa could combine all three of the letters a, b, and c in the box below.
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b) Using a pattern Issa then wrote down all the different combinations of the numbers 1, 2, 3, and 4.
Fill in the six missing combinations in the spaces below.
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1234
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1243
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1324
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1342
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1423
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1432
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2134
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2143
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2314
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2341
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2413
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2431
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3124
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3142
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___________
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___________
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3412
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___________
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4123
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4132
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___________
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4231
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___________
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___________
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