Question : Directions: Which of the following four options will replace the question mark (?) in the following series? 9, 45, ?, 540, 1080
Option 1: 180
Option 2: 240
Option 3: 300
Option 4: 360
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Correct Answer: 180
Solution : Given: 9, 45, ?, 540, 1080
Multiply the numbers starting from 5 in decreasing order – 9 × 5 = 45; 45 × 4 = 180; 180 × 3 = 540; 540 × 2 = 1080
So, the missing number is 180. Hence, the first option is correct.
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