Is the sequence 5,9,15,..an arthmetric sequence explain
2 answers:
Is not because 9 - 5 = 4; 15 - 9 = 6; 4 is not equal with 6!
If a, b, c is an arithmetic sequence then a + c = 2b
a = 5, b = 9, c = 15
subtitute
a + c = 5 + 15 = 20
2b = 2 · 9 = 18
20 ≠ 18
Answer: The sequence 5, 9, 15 is not an arithmetic sequence.
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