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

The sum of first four terms of an A.P. is $56$. The sum of last four terms is $112$. If its first term is $11$ then find the number of terms.

$\begin{array}{1 1}21 \\ 20 \\ 11 \\ 19 \end{array} $

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