Multiple choice

Find the missing term in the following number series- 241 \quad 121 \quad 61 \quad 31 \quad 16 \quad ?

  1. $8.5$
  2. $17$
  3. $9.5$
  4. $18$
  5. $10.5$
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A Correct answer
Explanation

The pattern alternates between subtracting 1 and dividing by 2. Starting with 241: 241-120=121 (subtracting half, rounding), 121-60=61 (subtracting half), 61-30=31 (approximately half), 31-15=16 (approximately half), then 16-7.5=8.5 (half of 16). The operation at each step is roughly: halve the previous number and subtract it from the current number. Option A (8.5) correctly continues this pattern.

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