V. This problem concerns the binomial identity below (for n > 3): (3= 2()) +2()() (a) Prove the above identity algebraically. (b) Describe a combinatorial proof of the identity. V. This problem concerns the binomial identity below (for n > 3): (3= 2()) +2()() (a) Prove the above identity algebraically. (b) Describe a combinatorial proof of the identity