Find the common difference of the arithmetic sequence - 11, -20, -29...
Arithmetic sequence
a (i) = -11 - 9 *(1-i)
a (1) = -11 - 9 *(1-1)
= -11
a (2) = -11 - 9 *(2-1)
= -20
a (3) = -11 - 9 *(3-1)
=-29
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Answer
Arithmetic sequence : a (i) = -11 - 9 *(1-i)
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