Find the value of '?' in the series: 12, 17, 15, ?, 18, 23, 21,... | Filo
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Class 11

Math

Co-ordinate Geometry

Straight Lines

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Find the value of in the series:

  1. 20
  2. 21
  3. 22
  4. 24
Correct Answer: Option(a)
Solution: The series alternates the addition of with the subtraction of .
So, the number is .
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