Multiple choice

Find the missing number in the following number series $33 \; ? \; 1617 \; 11319 \; 79233 \; 554631$

  1. 241

  2. 239

  3. 237

  4. 231

  5. None of these

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Look for the pattern: 33, 1617, 11319, 79233, 554631. Each term is multiplied by 7, then subtract 6: 33×7-6=231; 231×7-6=1617; 1617×7-6=11319; 11319×7-6=79233; 79233×7-6=554631. So the missing number is 231.