(1) + (1 + 1) + (1 + 1 + 1) + ....... + (1 + 1 + 1 + ...... n  1 times) = ......
\(\frac{{n\left( {n + 1} \right)}}{2}\)
\(\frac{{n\left( {n  1} \right)}}{2}\)
\({n^2}\)
n
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1
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Consider an infinite G.P. with first term a and common ratio r, its sum is 4 and the second term is 3/4, then
Solution 
2
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The sum of first n odd natural numbers in
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3
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For A.P. T18  T8 = ........ ?
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4
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If four numbers in A.P. are such that their sum is 50 and the greatest number is 4 times the least, then the numbers are
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5
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If a, b, c are in A.P., then (a – c)^{2}/ (b^{2} – ac) =
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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
Solution 
7
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Find the n^{th} term of the following sequence :
Solution 
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
Solution 
9
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Find the nth term of the following sequence :
Solution 
10
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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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