1) 45 handshakes because they should hands with every 10 person so it would be 9 shakes then 8 shakes then 7 shakes then 6 shakes till o shakes
2) 55 handshakes because one more person was added 10 the 10 people they shook hands with the 45 people
3) 190 because overall the handshakes that you did you repeated and add ten more people to the class and it would be 190
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