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05-04-2017
Mathematics

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What is the 43rd term of an arithmetic sequence with a rate of increase of -6 and a11 = 12?-174-176-180-186-240

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ghanami ghanami

05-04-2017

hello :
an = a1 +(n-1)d ..... d = -6 and a11 = 12
terme general : an = ap +(n-p)d
n= 43 and p = 11 a41 =a11+(43-11)(-6)
a41 = 12 -192 = 180

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