Multiple choice

Write the next term in the series given below. 1, 3, 6, 10, 15, ___

  1. 21

  2. 20

  3. 22

  4. 23
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A Correct answer
Explanation

The series follows the pattern of adding consecutive integers: 1+2=3, 3+3=6, 6+4=10, 10+5=15. The next term is 15+6=21.

AI explanation

This sequence is built by adding progressively larger integers to each preceding term. You add 2 to 1 to get 3, add 3 to 3 to get 6, add 4 to 6 to get 10, and add 5 to 10 to get 15. Adding 6 to 15 gives the final result of 21.

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