How many integers from 1 to 52 are divisible by 5 or by 4 (or both)?
Answer and explanation
Correct answer: A.
- Step 1: Divisible by 5: ; by 4: ; by both (multiples of 20): . Step 2. Count . **Answer: . Why not the others:** counts the common multiples twice; counts only the common multiples; is off by one.
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