Multiple choice

Find the missing number (P) in the following series. 12 13 61 P 1099 6539

  1. 140

  2. 210

  3. 223

  4. 199

  5. None of these
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Test all options: A=140: 13²-140² doesn't match 61. B=210: 13²-210² doesn't match 61. C=223: 13²-223² doesn't match 61. D=199: Check pattern: 13²+60=229≠61, 61²-60=3661≠P. No given option works. The 'None of these' option is correct - none of A-D satisfy the pattern.

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