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What should come in place of the question mark ‘?’ in the following number series?
60, 40, 50, ?, 180, 460
75
95
65
85
None of these
Let's break down the series:
- Notice the possible pattern.
- If we check, the pattern alternates between subtraction and multiplication:
- 60 - 20 = 40
- 40 + 10 = 50
- 50 × 2 = 100
- 100 + 80 = 180
- 180 + 280 = 460
- But let's look for a simpler logic—try differences:
- 60 to 40 = -20
- 40 to 50 = +10
- 50 to ?
- ? to 180
- 180 to 460 = +280
- Try a pattern of alternately subtracting and adding:
- -20, +10, (? - 50), (180 - ?), +280
- See if the increases themselves follow a pattern.
- Now, let's try multiplying:
- 60 × (2/3) = 40
- 40 × (5/4) = 50
- 50 × (7/5) = 70
- 70 × (9/7) = 90
- 90 × (23/9) = 230
- Now, if we check for 70 in the list, it's missing.
- Let's look at option 3: 65
- Option 4: 85
- Option 2: 95
- Now, check if 85 fits:
- 50 to 85 = +35
- 85 to 180 = +95
- The jumps seem to roughly triple each time:
- 35 × 2.7 ˜ 95
- 95 × 2.9 ˜ 280
- Thus, the correct answer in the sequence should be: 85
- Option 4: 85 (Highlighted as green tick)
By: Parvesh Mehta ProfileResourcesReport error
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