Question 1052554
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Each member of a club writes greeting cards to other members.the total no of greeting cards  is 110. find the no of members.?
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Let the number of members be "n", where n is an integer now unknown.


Then each member writes to (n-1) others.


Hence, the total number of greeting cards is n*(n-1).


The equation is


n*(n-1) = 110.


The solution is n = 11.