Y=x^2+3x-4 and y=4x-4
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Using permutations, it is found that there are 12 ways to pick a sequence of two different letters of the alphabet that appear in the word Crab .
The order in which the letters appears is important, as for example, ab is a difference sequence than ba, hence the <em>permutation formula</em> is used.
Permutation formula:
The number of possible permutations of x elements from a set of n elements is given by:
In this problem, 2 letters are picked from a set of 4, hence:
There are 12 ways to pick a sequence of two different letters of the alphabet that appear in the word Crab .
For more on permutations, you can check brainly.com/question/24905801