Multiple choice

Directions: Find the missing term in the following series. 2, 5, 17, 71, ?

  1. 131

  2. 247

  3. 359

  4. 419
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C Correct answer
Explanation

Pattern: 2*2+1=5, 5*3+2=17, 17*4+3=71, 71*5+4=359.

AI explanation

The pattern involves multiplying the previous term by a sequentially increasing integer and then adding an odd number. Multiplying 2 by 1 and adding 3 gives 5, then multiplying 5 by 3 and adding 2 gives 17, and multiplying 17 by 4 and adding 3 gives 71. Continuing the sequence, multiply 71 by 5 and add 4 to get 359. The missing term is 359.

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