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A matches seller arranged his matchbox in a triangular pattern, he continues until there are 11 matchboxes in the bottom row of the triangle. How many matchboxes are in the complete pattern?

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Can I please get the solution

1+2+3+...+11 = 11*12/2 = 66

read up on "triangular numbers"

12*11 =2S S=132\2 =66

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