Cual es la formula binomial C(k,r)? O a. k!/(r!"(k-r)!) Ob.n!/(k!*(n-k)!) Ocn!/(ri*(r-r)!) od n!/(ri*(n-r)) A Moving to the next question prevents changes to this answer. O E a Use binomial theorem to expand (1+x)?? O a. 1+4x+6x2+4x3+x4 O b. 1+3x+3x2+x3 O c. 1+xA O.d. 1+2x+x2 A Click Submit to complete this assessment