Multiple choice

Directions: Complete the series.

1, 2, 4, 10, 34, ?

  1. 154

  2. 35

  3. 68

  4. 40

  5. 106
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A Correct answer
Explanation

From the series, it is clear that every term is added to factorials of successive natural numbers.
 
1 + 1 * 1 = 2

2 + 1 * 2 = 4  

4 + 1 * 2 * 3 = 10  

10 + 1 * 2 * 3 * 4 = 34  

Similarly, 34 + 1 * 2 * 3 * 4 * 5 = 34 + 120 = 154

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