(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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The first and last term of an A.P. is a and l respectively. If S is the sum of all the terms of the A.P. and the common difference is given by \(\frac{{{l^2} - {a^2}}}{{k - \left( {l + a} \right)}}\) then k = ?
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2
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The 2nd and 8th term of an arithmetic progression are 17 and -1 respectively. What is the 14th term?
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3
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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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4
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15th term of A.P., x - 7, x - 2, x + 3, ........ is
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5
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A boy agrees to work at the rate of one rupee on the first day, two rupees on the second day, and four rupees on third day and so on. How much will the boy get if he started working on the 1st of February and finishes on the 20th of February?
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6
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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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7
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The sum of first five multiples of 3 is:
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8
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Find the nth term of the following sequence :
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9
Discuss
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For an A.P. if a25 - a20 = 45, then d equals to:
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10
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Find the nth term of the following sequence :
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