(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
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2
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If the nth term of an A.P. is 2n + 1, then the sum of first n terms of the A.P. is
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3
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If k, 2k – 1 and 2k + 1 are three consecutive terms of an AP, the value of k is
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4
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If 7 times the seventh term of an Arithmetic Progression (AP) is equal to 11 times its eleventh term, then the 18th term of the AP will be
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5
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The sum of n terms of an A.P. is 3n2 + 5n, then 164 is its
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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 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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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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9
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The 3rd and 8th term of an arithmetic progression are 13 and 2 respectively. What is the 14th term?
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10
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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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