Sum of Binomial Series (Jee Mains) | ExamDuo
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Terms of Binomial Expansion
Hard
Sum of Binomial Series
The sum of the series 2 × 1 ×
20
C
4
– 3 × 2 ×
20
C
5
+ 4 × 3 ×
20
C
6
– 5 × 4 ×
20
C
7
+…+18 × 17 ×
20
C
20
, is equal to
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