Sum of n terms of the series \(\sqrt 2 + \sqrt 8 + \sqrt {18} + \sqrt {32} + \) ....... is
\(\frac{{n\left( {n + 1} \right)}}{2}\)
\(2n\left( {n + 1} \right)\)
\(\frac{{n\left( {n + 1} \right)}}{{\sqrt 2 }}\)
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Which term of the A.P. 24, 21, 18, ............ is the first negative term?
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2
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What is the sum of the first 13 terms of an arithmetic progression if the first term is -10 and last term is 26?
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3
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Find the first term of an AP whose 8th and 12th terms are respectively 39 and 59.
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4
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If the sums of n terms of two arithmetic progressions are in the ratio \(\frac{{3n + 5}}{{5n + 7}}\) then their nth terms are in the ration
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5
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After striking the floor, a rubber ball rebounds to 4/5th of the height from which it has fallen. Find the total distance that it travels before coming to rest if it has been gently dropped from a height of 120 metres.
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6
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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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7
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The sum of n terms of an A.P. is 3n2 + 5n, then 164 is its
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8
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How many 2-digit positive integers are divisible by 4 or 9?
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9
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What is the sum of the first 11 terms of an arithmetic progression if the 3rd term is -1 and the 8th term is 19?
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10
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The first term of an Arithmetic Progression is 22 and the last term is -11. If the sum is 66, the number of terms in the sequence are:
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