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Mathematics
Problem
For a certain sequence the sums of the first five and six terms are
S
5
=
40
S_5 = 40
S
5
=
40
and
S
6
=
54
S_6 = 54
S
6
=
54
respectively. Find the sixth term
a
6
a_6
a
6
. a)
12
12
12
b)
9
9
9
c)
14
14
14
d)
15
15
15
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