Which shapes appear to have perpendicular sides

Question part points submissions used suppose that 100 lottery tickets are given out in sequence to the first 100 guests to arrive at a party. of these 100 tickets, only 12 are winning tickets. the generalized pigeonhole principle guarantees that there must be a streak of at least l losing tickets in a row. find l.

What properties allow transformation to be used as a problem solving tool

Which of the following are accepted without proof in a logical system? check all that apply.