If the nth term of an A.P. is 2n + 1, then the sum of first n terms of the A.P. is
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What is the sum of the first 11 terms of an arithmetic progression if the 3rd term is -1 and the 8th term is 19?
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2
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If the fifth term of a GP is 81 and first term is 16, what will be the 4th term of the GP?
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3
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The 3rd and 8th term of an arithmetic progression are -13 and 2 respectively. What is the 14th term?
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4
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The 4th and 7th term of an arithmetic progression are 11 and -4 respectively. What is the 15th term?
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5
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If 18th and 11th term of an A.P. are in the ratio 3 : 2, then its 21st and 5th terms are in the ratio
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6
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The sum of the first four terms of an A.P. is 56. The sum of the last four terms is 112. If its first term is 11, the number of terms is
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7
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If the sum of the series 2 + 5 + 8 + 11 … is 60100, then the number of terms are
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8
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Two A.P.’s have the same common difference. The first term of one of these is 8 and that of the other is 3. The difference between their 30th terms is
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9
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If the first term of an A.P. is 2 and common difference is 4, then the sum of its 40 term is
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10
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The number of terms of the A.P. 3, 7, 11, 15, ....... to be taken so that the sum is 406 is
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