201.If Sn, the sum of first n terms of an A .P. is given by Sn = 3n2 – 4n, then find its nth term.
Solution not provided. Ans. 6n - 7
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202.If Sn, the sum of first n terms of an A .P. is given by Sn = Sn2 + 3n, then find its nth term.
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203.The sum of 4th and 8th terms of an A .P. is 24 and sum of 6th and 10th terms is 44. Find A .P.
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204.The sum of 5th and 9th terms of an A .P. is 72 and the sum of 7th and 12th terms is 97. Find the A .P.
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205.If 4/5, a, 2 are three consecutive terms of an A .P., then find the value of a.
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206.Which term of the A .P. 3, 15, 27, 39,.....will be 120 more than its 21 st term.
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207.The sum of first six terms of an A .P. is 42. The ratio of its 10th term to its 30th term is 1 : 3. Calculate the first and the thirteen term of the A .P.
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208.For what value of k, are the numbers x, 2x + k and 3x + 6 three consecutive terms of an A .P.?
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209.
Which term of AP; 121, 117, 113,.....is its first negative terms ? (a) 31 (b) 33 (c) 32 (d) 34
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210.If last term of an AP is – 10 and first term and common difference are 100, –2 then the no. of terms ‘n’ will be : (a) 55 (b) 56 (c) 57 (d) 58
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