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Questions  >>  CBSE XI  >>  Math  >>  Sequences and Series
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Q)

How many terms of the A.P. $-6,-\large\frac{11}{2}$$, -5........$ are needed to give the sum $-25$

$\begin{array}{1 1}20\;or\;5 \\ 25\;or \;4 \\ 21 \\ 24 \end{array} $

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