The sum of first five multiples of 3 is:
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1
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If an A.P. has a = 1, tn = 20 and sn = 399, then value of n is :
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2
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The two geometric means between the number 1 and 64 are
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3
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The 3^{rd} and 7^{th} term of an arithmetic progression are 9 and 11 respectively. What is the 15^{th} term?
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4
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What is the sum of the first 17 terms of an arithmetic progression if the first term is 20 and last term is 28?
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5
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If sum of n terms of an A.P. is 3n^{2} + 5n and T^{m} = 164 then m =
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6
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If S1 is the sum of an arithmetic progression of ‘n’ odd number of terms and S2 is the sum of the terms of the series in odd places, then \(\frac{{{S_1}}}{{{S_2}}}\)
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7
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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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8
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How many terms are there in the GP 5, 20, 80, 320........... 20480?
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9
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If a + 1, 2a + 1, 4a  1 are in A.P., then the value of a is:
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10
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How many terms are there in 20, 25, 30 . . . . . . 140?
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