What is the sum of the following series? 64, 66, 68, ......, 100
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If the first term of an A.P. is 2 and common difference is 4, then the sum of its 40 term is
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2
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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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3
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The first term of an Arithmetic Progression is 22 and the last term is 11. If the sum is 66, the number of terms in the sequence are:
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4
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If the fifth term of a GP is 81 and first term is 16, what will be the 4th term of the GP?
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5
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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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6
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If a + 1, 2a + 1, 4a  1 are in A.P., then the value of a is:
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7
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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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8
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The 4th and 7th term of an arithmetic progression are 11 and 4 respectively. What is the 15th term?
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9
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In an A.P., if d = 4, n = 7, an = 4, then a is
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10
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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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