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Mathematics
Problem
If
S
n
=
4
+
11
+
21
+
34
+
50
+
…
S_n = 4 + 11 + 21 + 34 + 50 + \dots
S
n
=
4
+
11
+
21
+
34
+
50
+
…
to
n
n
n
terms, then
1
60
(
S
29
−
S
9
)
\frac{1}{60}(S_{29} - S_9)
60
1
(
S
29
−
S
9
)
is equal to (a) 223 (b) 220 (c) 226 (d) 227
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