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Mathematics
Mathematics
Problem
The first term of an AP is
8
8
8
. If the average of its first seven terms is
20
20
20
, the common difference
d
d
d
is a)
4.8
4.8
4.8
b)
2
2
2
c)
4
4
4
d)
24
7
\dfrac{24}{7}
7
24
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