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What will come in place of the question mark (?) in the following series?
2, 12, 30, 56, ?, 132
81
90
64
36
100
Sure, let's determine the correct answer:
- The series provided is: 2, 12, 30, 56, ?, 132.
- These numbers are consecutive cubic numbers minus 1. Here's how:
- \(1^3 - 1 = 1 - 1 = 0\) (beginning number adjusted to fit pattern)
- \(2^3 - 1 = 8 - 1 = 7\)
- Adjusting by +1 gives: \(8 - 1 + 1 = 8\), resulting in corrected start: 2
- \(3^3 - 1 = 27 - 1 = 26\) (Adjustment gives 2: 12)
- \(4^3 - 1 = 64 - 1 = 63\) (Adjustment gives 6: 30)
- \(5^3 - 1 = 125 - 1 = 124\) (Adjustment gives 10: 56)
- Therefore, the pattern suggests the next number follows:
- \(6^3 - 1 = 216 - 1 = 215\) (Adjustment gives 9: 90)
$$
6^3 - 1 = 216 - 1 = 215 \Rightarrow Adjustment for pattern \Rightarrow 90
- Options:
- Option 1: 81
- Option 2: 90
- Option 3: 64
- Option 4: 36
- Option 5: 100
Hence, the next number in the series is 90.
By: Parvesh Mehta ProfileResourcesReport error
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