An arithmetic sequence is given. Find the common difference and write out the first four terms.{sn} = {11 - 5n}
A. d = -5; s1 = 6, s2 = 3 , s3 = -2 , s4 = -7
B. d = 5; s1 = 6, s2 = 11 , s3 = 16 , s4 = 21
C. d = -5; s1 = -5, s2 = -10, s3 = -15, s4 = -20
D. d = -5; s1 = 6, s2 = 1, s3 = -4, s4 = -9
Answer: D
Mathematics
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