 
 <translate> Student: A card shop contains 10 birthday cards, 10 holiday cards, and 9 graduation cards. If three cards are purchased at random from the shop, what is the probability that the three cards will be of the same type?
Options:
(A) 3/29
(B) 12/58
(C) 12/840
(D) 7/841
(E) 12/841.
Another student: Let's say, hmmm...
 <ibo> Nwa akwụkwọ: Otu ụlọ ahịa na-ere kaadị nwere kaadị ọmụmụ 10, kaadị ezumike 10, na kaadị ngụsị akwụkwọ 9. Ọ bụrụ na a zụrụ kaadị atọ n'ụlọ ahịa ahụ n'echeghị ha eche, olee otú o nwere ike isi bụrụ na kaadị atọ ahụ bụ otu ụdị? Nhọrọ: (A) 3/29 (B) 12/58 (C) 12/840 (D) 7/841 (E) 12/841. Nwa akwụkwọ ọzọ: Ka anyị kwuo, hmmm... 