Playing cards is an activity that stimulates reasoning. A traditional game is Solitaire, which uses 52 cards. Initially seven columns are formed with the cards. The first column has one card, the second has two cards, the third has three cards, the fourth has four cards, and so on until the seventh column, which has seven cards, and what remains forms the stock, which are the cards not used in the columns. The number of cards that forms the stock is (A) 21. (B) 24. (C) 26. (D) 28. (E) 31.
Playing cards is an activity that stimulates reasoning. A traditional game is Solitaire, which uses 52 cards. Initially seven columns are formed with the cards. The first column has one card, the second has two cards, the third has three cards, the fourth has four cards, and so on until the seventh column, which has seven cards, and what remains forms the stock, which are the cards not used in the columns.
The number of cards that forms the stock is\\
(A) 21.\\
(B) 24.\\
(C) 26.\\
(D) 28.\\
(E) 31.