### Quiz Question 7: Given three digits 0, 3, 5. How many 3-digit natural numbers are there whose digits are different?

Think and answer the question before looking at the answer

Answer:

Since a 0, a = 3 or a = 5

When a = 3 then b = 0 or b = 5 we get 2 numbers, 305 and 350

When a = 5 then b = 0 or b = 3 we get 2 numbers, 503 and 530

So the numbers to look for are 304, 350, 503, 530

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QUIZ MATH 6