Using the letters A and B, the following two-letter code words can be formed: AA, AB, BB,Ba. Using the letters A, B, and C, how
many different three-letter code words can be formed?
I know that the answer is 27 from the answer sheet, but how? Can you please list the combinations? Thanks!
I know that the answer is 27 from the answer sheet, but how? Can you please list the combinations? Thanks!
2 answers:
Answer:
27
Step-by-step explanation:
Make a tree-diagram for all three-letter code words starting with A. Each path from the top to the bottom contains 3 letters, which is one of the code words beginning with A. There are 9 such code words. Clearly, there are 9 code words starting with B and 9 starting with C. In all, there are 27 code words.
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Solution:
A perfect square is a number that can be expressed as the product of an integer by itself or as the second exponent of an integer.
Hence, the number that can be expressed as a product of an integer by itself is;
Therefore, the perfect square is 81.
OPTION B is correct.