$7$ friends promise to each send a postcard to $3$ others. Is it possible that everybody receives postcards only from people they sent postcards to?
93243
25 students, each gives a chocolate to 5 other students. Could every student receive a chocolate from exactly the 5 students they've sent to?
79493
Probability of 3 people in a room of 30 having the same birthday
148557
Unexpected goods delivery - is this a scam, and what kind of scam?
155759
Is someone misusing my email to post on SE?
117767
Put bounties on other people's questions?
110332
How can you send the same text to multiple people without it being a group message?
19257
Is it a scam if the person only wants to deposit into my account, not make a withdrawal?
99288
Paying someone to give me money
36551
How does the referral system work?
53631
Probability question (Birthday problem)
127770
Can I send money to my friend's Steam wallet?
113447
4 cards are drawn from a pack without replacement. What is the probability of getting all 4 from different suits?
31577
If my credit card payment is due in 3 days time, will anything I order today have to be paid by then too?
76492
Is this reply promising a money order and cashier check a scam?
145435
Birthday paradox with a (huge) twist: Probability of sharing exact same date of birth with partner?
146720
Expected number I will be on after drawing cards until I get an ace, 2, 3, and so forth
118625
How to start a letter to 2 persons?