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example of harmonic sequence?

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Ltramos2000viz
find the 10th term
1/16 , 1/12 , 1/8
a1=16 d= -4 , n=10
an=a1+(n-1)d
a10=16+(10-1)-4
a10=16+9(-4)
a10=16-36
a10= -20 or - 1/20 the 10th term. Click thank's. :)