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Sum of First n Terms of an AP (Part 1) | Arithmetic Progressions| CBSE | Class 10 | Math
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1 Q6. The 14th term of an A.P. is twice its 8th term. Its 6th term is -8, then the sum of its first 20 terms. 4:24

1 Q5. The first and last terms of an AP are 7 and 49 respectively. If sum of all its terms is 420, find its common difference. 2:54

1 Q4. How many terms of the AP 17,15,13,11....must be added to get the sum 72?explain the double answer 3:34

1 Q2. If the sum of the first n terms of an AP is 1/2(3n²+7n) then find its nth term. Hence find its 20th term. 3:02

1 Q1. Find the sum of first n terms of an AP whose nth term is 5n -1. Hence find the sum of first 20 terms. 2:29
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