Three digit number when sum of five permutation given PMONK 2015 Level 6 No. 25

Question In any group of six people, there are either 3 mutual friends or 3 mutual strangers. Proof?…

Answer There are two type of numbers greater than 3000 that can be formed here namely, 4 digit…

                Here’s a possible solution: Note the pattern: (no. on the…

Answer You are essentially getting the number X which is of the form below : X = 2^a…