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  1. The average of 25 results is 18, that of first twelve is 14 and of last twelve is 17 . Thirteenth result is?
    1. 28
    2. 72
    3. 78
    4. 85
Correct Option: C

Thirteenth Result = sum of all 25 results - sum of first 12 results - sum of last 12 results.
= 25 x 18 - 12 x 14 – 12 x 17
=78


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