The sum of the first 16 terms of an AP whose first term and third term are 5 and 15 respectively is
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1
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How many 2-digit positive integers are divisible by 4 or 9?
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2
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Which term of the A.P. 24, 21, 18, ............ is the first negative term?
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3
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The sum of first n odd natural numbers in
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4
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The two geometric means between the number 1 and 64 are
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5
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Find the 15th term of the sequence 20, 15, 10 . . . . .
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6
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If the sum of n terms of an A.P. be 3n2 + n and its common difference is 6, then its first term is
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7
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The sum of first five multiples of 3 is:
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8
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In an A.P., if d = -4, n = 7, an = 4, then a is
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9
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The sum of the first and third term of an arithmetic progression is 12 and the product of first and second term is 24, then first term is
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10
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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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