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Mathematics
Problem
If
a
1
,
a
2
,
a
3
,
…
a_1, a_2, a_3, \dots
a
1
,
a
2
,
a
3
,
…
are in A.P. such that
a
1
+
a
7
+
a
16
=
40
a_1 + a_7 + a_{16} = 40
a
1
+
a
7
+
a
16
=
40
, then the sum of the first 15 terms of this A.P. is: (1) 200 (2) 280 (3) 120 (4) 150
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