How many terms are there in the GP 5, 20, 80, 320........... 20480?
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1
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If 18, a, b - 3 are in A.P. then a + b =
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2
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If three numbers be in G.P., then their logarithms will be in
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3
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Find the 15th term of the sequence 20, 15, 10 . . . . .
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4
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Which term of the A.P. 92, 88, 84, 80, ...... is 0?
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5
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The 2nd and 6th term of an arithmetic progression are 8 and 20 respectively. What is the 20th term?
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6
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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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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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8
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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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9
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What is the sum of the first 9 terms of an arithmetic progression if the first term is 7 and last term is 55?
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10
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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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