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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If 18th and 11th term of an A.P. are in the ratio 3 : 2, then its 21st and 5th terms are in the ratio
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If Sn denote the sum of the first n terms of an A.P. If S2n = 3Sn , then S3n : Sn is equal to
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Which term of the A.P. 24, 21, 18, ............ is the first negative term?
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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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What is the sum of all positive integers up to 1000, which are divisible by 5 and are not divisible by 2?
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Sum of n terms of the series \(\sqrt 2 + \sqrt 8 + \sqrt {18} + \sqrt {32} + \) ....... is
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7
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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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The 3rd and 8th term of an arithmetic progression are 13 and 2 respectively. What is the 14th term?
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9
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If the sum of the series 2 + 5 + 8 + 11 … is 60100, then the number of terms are
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10
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If the 3rd and the 5th term of an arithmetic progression are 13 and 21, what is the 13th term?
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