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find the sum of the interior angles of polygon having 7 sides​

By Brielle

find the sum of the interior angles of polygon having 7 sides​

About the author
Brielle

15. X number of men can finish a piece of work in 30
days. If there were 6 men more, the work could be
finished in 10 da

If a, b, c are the midvalues of classes and a, b, c are their frequencies respectively then
what is the A.M ?​

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