Please help ASAP for the brainliest answer
2 answers:
Answer:
arithmetic sequence
Step-by-step explanation:
The next number is 21
Answer:
Triangular Number Sequence
21
Step-by-step explanation:
This sequence is called the Triangular Number Sequence.
To find the next term, add 6 to 15.
The next term in the sequence is 21.
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