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Mathematics
Problem
Let
S
n
S_n
S
n
denote the sum of first
n
n
n
-terms of an arithmetic progression. If
S
10
=
530
S_{10} = 530
S
10
=
530
,
S
5
=
140
S_5 = 140
S
5
=
140
, then
S
20
−
S
6
S_{20} - S_6
S
20
−
S
6
is equal to (a) 1862 (b) 1852 (c) 1842 (d) 1872
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