Find the 15th term of the sequence 20, 15, 10 . . . . .
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1
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The sum of first n odd natural numbers in
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2
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What is the sum of the following series? -64, -66, -68, ......, -100
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3
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If three numbers be in G.P., then their logarithms will be in
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4
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If a, b, c are in A.P., then (a – c)2/ (b2 – ac) =
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5
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In an A.P., if d = -4, n = 7, an = 4, then a is
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6
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Find the nth term of the following sequence :
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7
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The common difference of the A.P. \(\frac{1}{3}, \frac{{1 - 3b}}{3} , \frac{{1 - 6b}}{3}\) . . . . . . is
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8
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(1) + (1 + 1) + (1 + 1 + 1) + ....... + (1 + 1 + 1 + ...... n - 1 times) = ......
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9
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How many terms are there in the GP 5, 20, 80, 320........... 20480?
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10
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15th term of A.P., x - 7, x - 2, x + 3, ........ is
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