The algebraic expression of an arithmetic sequence is 3-2n,what is its common difference and first term?
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Step-by-step explanation:
1st term = 3-2×1
=3-2 = 1
2nd term = 3 - 2×2
= 3-4 = -1
d = 2nd term - 1st term
= -1 - 1
= -2
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