Explanation:
Casey wears shirt, skirt and blazer.
Casey has to choose shirt among the shirts available to her.So,the number of ways she can choose a shirt is .
Casey has to choose skirt among the skirts available to her.So,the number of ways she can choose a skirt is .
Casey has to choose blazer between the blazers available to her.So,the number of ways she can choose a blazer is .
The total number of possible combinations is the product of number of ways she can choose a shirt,number of ways she can choose a skirt and number of ways she can choose a blazer.
So,the total combinations are
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