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23-10-2016
Mathematics

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Find the 40th term of the arithmetic sequence.-1, -5, -9, -13, -17, ...

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23-10-2016

an=a1+d(n-1)
a1=firt term
d=commondifference

-1-4=-5

common difference=-4
first term is -1

an=-1-4(n-1)
40th term
a40=-1-4(40-1)
a40=-1-4(39)
a40=-1-156
a40=-157

40th term is -157

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