If 18, a, b  3 are in A.P. then a + b =
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The sum of the first four terms of an A.P. is 56. The sum of the last four terms is 112. If its first term is 11, the number of terms is
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The sum of first five multiples of 3 is:
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3
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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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4
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How many terms are there in 20, 25, 30 . . . . . . 140?
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5
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The sum of first n odd natural numbers in
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6
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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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The 2^{nd} and 6^{th} term of an arithmetic progression are 8 and 20 respectively. What is the 20^{th} term?
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8
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Find the nth term of the following sequence :
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9
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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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10
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If sum of n terms of an A.P. is 3n^{2} + 5n and T^{m} = 164 then m =
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