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How to solve these ? Plz help !
1)1)if a,b,c,d and f are in ap then e - c is equal to ? ( Board 2009 , 1 marks )
2)If in any decreasing ap , sum of all its terms is equal to -36, the sum of all its terms, except the last term is zero and the difference of the 10th and the 6th term is equal to -16, then first term of the series is ? ( Board 2011 , 3 marks )
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