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Example 2:
Look for a pattern then write the next three terms.
Sequence
1. a, 2b, 3c,
2. a + b, a + 2b, a + 3b,
3. 7a, 5a, 3a

Next three terms
4d 5e, 6f, 7g
a + 4b, a + 5b
a, -a, -3a​