In the number chain it is written: 1, 3, 6, 10. Each time they add one more than the last time. What number will be next?
Show hints
- Look how much the neighboring numbers increase.
- After increments 2, 3 and 4 there should be an increment of 5.
Show the answer and solution
Answer: 15
We added 2, then 3, then 4. The next increase is 5, so we get 15.