Multiple choice

The series given below has one wrong number find that number and answer the question. 32, 39, 65, 128, 253, 467, 809, 1320

  1. 39

  2. 65

  3. 253

  4. 467

  5. 32
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The series follows the pattern: 2^n + 1 where n increases by 1 each time. 2^3+1=9, 2^4+1=17, 2^5+1=33, 2^6+1=65, 2^7+1=129, 2^8+1=257, 2^9+1=513. The given series has 32 (wrong), 39 (wrong), 65, 128, 253 (wrong, should be 257), 467 (wrong), 809 (wrong), 1320 (wrong). 253 is incorrect as it should be 257.

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