Question : Which is the least number divisible by 6, 18, 20, and 32?
Option 1: 108
Option 2: 640
Option 3: 1440
Option 4: 360
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Correct Answer: 1440
Solution : The least number divisible by 6, 18, 20 and 32 is their least common multiple (LCM). Factors of 6 = 2 × 3 Factors of 18 = 2 × 3 × 3 Factors of 20 = 2 × 2 × 5 Factors of 32 = 2 × 2 × 2 × 2 × 2 $\therefore$ The LCM of 6, 18, 20, and 32 = 2 × 2 × 2 × 2 × 2 × 3 × 3 × 5 = 1440 Hence, the correct answer is 1440.
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Question : Directions: Identify the number that does NOT belong to the following series. 1.5, 2, 3, 6, 18, 108, 1964
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