1) 45 handshakes between the 10 students.
I got this answer by adding 9, 8, 7, 6, 5, 4, 3, 2, 1 & I got 45 .
2) 55 handshakes after another student enters late.
To get this answer i just added 10 to 45 because 1 student shook hands with 10 students.
3) 190 handshakes between 20 students.
I got my answer by just getting the 55 handshakes from the 11 students and added 11, 12, 13, 14, 15, 16, 17, 18, & 19.
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