Find the pair of numbers that can replace the question mark (?) in the following series: \(90,180,12,50,100, ?, ?, 3,50,4,25,2,6,30,3\).
Question and options
Find the pair of numbers that can replace the question mark (?) in the following series:
.
.
- 20,75
- 200,150
- 150,1
- 120,30
Answer and explanation
Correct answer: B - 200,150
Read backwards, the series ends 3,30,6,2,25,4,50,3. Each opening term is the product of consecutive terms of that reversed list: 3x30=90, 30x6=180, 6x2=12, 2x25=50, 25x4=100, then 4x50=200 and 50x3=150.
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JIPMAT
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