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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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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How many 2digit positive integers are divisible by 4 or 9?
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If an A.P. has a = 1, tn = 20 and sn = 399, then value of n is :
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The common difference of the A.P. \(\frac{1}{{2b}} \frac{{1  6b}}{{2b}} \frac{{1  12b}}{{2b}}\) . . . . . is
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In an A.P., if d = 4, n = 7, an = 4, then a is
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The sum of first five multiples of 3 is:
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The sum of n terms of an A.P. is 3n2 + 5n, then 164 is its
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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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Let S denotes the sum of n terms of an A.P. whose first term is a. If the common difference d is given by d = S_{n} – k S_{n1} + S_{n2} then k =
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In an A.P., if d = 4, n = 7, a_{n} = 4, then a is
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