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03-02-2017
Mathematics

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The first term of an arithmetic sequence is 4 & the tenth term is 67 what is the common different?

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03-02-2017

an=a1+d(n-1)
a1=first term
d=common differntce

a1=4

a10=67

a10=4+d(10-1)
67=4+d(9)
minus 4 both sides
63=9d
divide both sides by 9
7=d

common differnee is 7

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