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JEE Math Practice Question

The number of terms of an A.P. is even; the sum of all the odd terms is 24 , the sum of all the even terms is 30 and the last term exceeds the first by $\frac{21}{2}$. Then the number of terms which are integers in the A.P. is :

  1. A.6
  2. B.4
  3. C.8
  4. D.10

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