Multiple choice

Directions: Find the missing term in the following number series: 11, 25, 53, 109, 221, ?

  1. 224

  2. 436

  3. 440

  4. 445

  5. 450
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D Correct answer
Explanation

The pattern is 11*2+3=25, 25*2+3=53, 53*2+3=109, 109*2+3=221, 221*2+3=445.

AI explanation

The pattern involves multiplying the previous term by 2 and then adding 3 to find the next term. We calculate 11 * 2 + 3 = 25, 25 * 2 + 3 = 53, 53 * 2 + 3 = 109, and 109 * 2 + 3 = 221. Applying this to the last term, we compute 221 * 2 + 3, which equals 442 + 3, giving the result 445.

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