If a + 1, 2a + 1, 4a  1 are in A.P., then the value of a is:
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The sum of first n odd natural numbers in
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If 7 times the seventh term of an Arithmetic Progression (AP) is equal to 11 times its eleventh term, then the 18th term of the AP will be
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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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How many terms are there in 20, 25, 30 . . . . . . 140?
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Which term of the A.P. 24, 21, 18, ............ is the first negative term?
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Which term of the A.P. 92, 88, 84, 80, ...... is 0?
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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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Find the 15th term of the sequence 20, 15, 10 . . . . .
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A boy agrees to work at the rate of one rupee on the first day, two rupees on the second day, and four rupees on third day and so on. How much will the boy get if he started working on the 1st of February and finishes on the 20th of February?
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