In an A.P., if d = -4, n = 7, an = 4, then a is
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How many terms are there in 20, 25, 30 . . . . . . 140?
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2
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If the sum of n terms of an A.P. be 3n2 + n and its common difference is 6, then its first term is
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3
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The 3rd and 7th term of an arithmetic progression are -9 and 11 respectively. What is the 15th term?
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4
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The 3rd and 7th term of an arithmetic progression are -9 and 11 respectively. What is the 15th term?
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5
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Find the 15th term of the sequence 20, 15, 10 . . . . .
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6
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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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7
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The sum of the first 16 terms of an AP whose first term and third term are 5 and 15 respectively is
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8
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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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9
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The sum of n terms of an A.P. is 3n2 + 5n, then 164 is its
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10
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The common difference of the A.P. \(\frac{1}{{2b}} \frac{{1 - 6b}}{{2b}} \frac{{1 - 12b}}{{2b}}\) . . . . . is
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