In a function hall first row is 20 chairs, second 24, third row 28 chairs...and total chairs arranged in 30 rows,then how many chairs are present in function hall?
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the total number of chairs in the hall is 2340 it is an arithmetic progression with first term 20 and common diffrence 4
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which formula
sum of series is equal to n/2x(2a plus (n-1)d where a is the first term n is the no of terms and d is the common difference
Tq
what is Tq
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