Permutation and combination sum (Jee Mains) | ExamDuo
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Permutation and combination sum
If
1
P
1
+
2
.
2
p
2
+
3
.
3
P
3
+
.
.
.
+
15
.
15
P
15
=
q
P
r
−
s
,
0
≤
s
≤
1
,
then
q
+
s
C
r
−
s
is equals to
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