How many terms of the A.P. -6, `-(11)/2,\ -5ddot` are needed to give the sum -?

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How many terms of the A.P. -6, -(11)/2,\ -5,... are needed to give the sum -25?

How many terms of the A.P. 6 , -(11)/2 ,-5,dotdotdot are needed to give the sum 25 ?

How many terms of the A.P., -6,(-11)/(2),-5 ... are needed to give the sum-25 ?

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How many terms of the A.P. 1,4,7.... are needed to give the sum 715?

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