Question: Triangular Numbers Practice 1. Handshake problem. At a meeting of 18 members of a club, each member shakes hands with every other member exactly once.

Triangular Numbers Practice 1. Handshake problem. At a meeting of 18 members of a club, each member shakes hands with every other member exactly once. What is the total number of handshakes? 2. How many handshakes if there are 25 members in attendance? 3. How many handshakes for n members? 4. Find the triangular number for a triangle with the base numbers of: (show your work) a. 55 b . 72 C . 78 5. Draw a triangle with a base of 10 6. Are the following numbers triangular? (show your work) a. 78 b. 45 C. 91

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