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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Answer:
.
Step-by-step explanation:
Start by finding the slope of this line.
If a slanting line goes through and
, where
, the slope of this line would be:
.
The line in this question goes through and
. Hence, the slope of this line would be:
.
If a slanting line with a slope of and goes through the point
, the equation of this line in the point-slope form would be:
.
For the line in this question, the slope is . Take
as the chosen point on this line. The point-slope form equation of this line would be:
.
Rewrite to obtain the equation of this line in the slope-intercept form:
.