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Which number is missing in the series: 5, 10, 15, ?, 25

Practice Questions

Q1
Which number is missing in the series: 5, 10, 15, ?, 25
  1. 18
  2. 20
  3. 22
  4. 24

Questions & Step-by-Step Solutions

Which number is missing in the series: 5, 10, 15, ?, 25
  • Step 1: Look at the series of numbers: 5, 10, 15, ?, 25.
  • Step 2: Identify the pattern in the series. Notice that each number is increasing.
  • Step 3: Find the difference between the numbers. 10 - 5 = 5 and 15 - 10 = 5.
  • Step 4: Since the difference is 5, we can add 5 to the last known number (15).
  • Step 5: Calculate 15 + 5, which equals 20.
  • Step 6: Place the number 20 in the series: 5, 10, 15, 20, 25.
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