Find the sum of the odd numbers between 0 and 50. A contract on construction job specifies a penalty for delay of completion beyond a certain date as follows: Rs. 200 for the first day, Rs. 250 for the second day, Rs. 300 for the third day, etc., the penalty for each succeeding day being Rs. 50 more than for the preceding day. How much money the contractor has to pay as penalty if he has delayed the work by 30 days?

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The odd numbers between 0 and 50 are 1, 3, 5, 7, 9 … 49 This forms an A.P. a = 1 d = 2 l = 49 n - 1 = 24 n = 25 = 625
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The odd numbers between 0 and 50 are 1, 3, 5, 7, 9 … 49 This forms an A.P. a= 1 d= 2 l= 49 n- 1 = 24 n= 25 = 625 read less
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