A code is formed using four of these letters: A, B, I, K, N, O, and T. (Note that the order of the letters in the code matters;
for example, ABIK is a different code from BAIK.) The size of the sample space is . The probability that the first three letters of the four-letter code are vowels is .
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<h2>PERIMETER</h2>
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<em>the formula for perimeter of a Rectangle is this ::</em>
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