TN 11th Maths Exercise 4 .3 Q.No.8 Combinatorics and Mathematical Induction TN New Syllabus

11th Maths New Syllabus Best Coaching Combinatorics Exercise 4 .3 Q No 8
Prove that if 1 ≤ r ≤ n then n ×(n−1) Cr−1 = (n − r + 1)nCr−1.

[tamizhanontdm]

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[safronbarith]

Sir indha sum la mattum y RHS first edhukkureenga?

[danielsundarsingh]

sir it is really helpful to revise the sum fastly . Thank you sir

[Aishwarya]

This excercise is such a challenging one but most important one 😑

[santhoshsubramani]

Sir why u are taking here only
RHS ? please say sir