 
 <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...
 <hau> Ɗalibi: Wani kantin sayar da katin yana da katunan ranar haihuwar 10, katunan hutu 10, da katunan digiri 9. Idan aka sayi katunan uku a bazuwar daga shagon, menene yiwuwar cewa katunan uku za su kasance iri ɗaya? Zaɓuɓɓuka: (A) 3/29 (B) 12/58 (B) 12/58 (B) 12/58 (C) (C) 12/840 (C) 12/840 (C) 12/840 (D) (D) 7/841 (D) 7/841 (D) 7/841 (D) (E) 12/841. (E) Me ya sa ba za a yi haka ba? Wani ɗalibi: Bari mu ce, hmmm... 