Sequences Questions

The activity
  • This activity displays a sequence of numbers
  • The next value in the sequence needs to be determined
  • Up to three clues can be viewed to help determine the answer

Find the next value in the sequence:

3 6 10 15

Sequence: 3 6 10 15

This is a sequence of triangular numbers.

Sequence: 3 6 10 15

The difference between each term increases by one.

Sequence: 3 6 10 15

An expression for the nth term is (n + 1)(n + 2)/2.

Sequence: 3 6 10 15
  • This is a sequence of triangular numbers.
  • The difference between each term increases by one.
  • An expression for the nth term is (n + 1)(n + 2)/2.

The answer is 21

Current Question

Remaining attempts: 3