Sum of First n Terms of AP
Sum of First n Terms of AP
Let the first term and common difference of an AP containing n terms be a and d, respectively.
Let be the last term of an AP.
Then, the sum of n terms of the AP is
Illustration 1. A contract on construction job specifies a penalty for delay in completion of the work beyond a certain data is 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 penalty. What penalty should the contractor pay, if he delays the work by 10 days ?
A. Rs. 4950 B. Rs. 4250 C. Rs. 3600 D. Rs. 650
Answer: B
Find the sum of 20 terms of the A.P. 1,4,7,10... | |||
| Right Option : D | |||
| View Explanation | |||
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