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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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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2
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What is the sum of the first 12 terms of an arithmetic progression if the 3rd term is -13 and the 6th term is -4?
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3
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What is the sum of the first 13 terms of an arithmetic progression if the first term is -10 and last term is 26?
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4
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The 3rd and 8th term of an arithmetic progression are -13 and 2 respectively. What is the 14th term?
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5
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The common difference of the A.P. \(\frac{1}{{2b}} \frac{{1 - 6b}}{{2b}} \frac{{1 - 12b}}{{2b}}\) . . . . . is
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6
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If log 2, log (2x -1) and log (2x + 3) are in A.P, then x is equal to ___
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7
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The first and last term of an A.P. is a and l respectively. If S is the sum of all the terms of the A.P. and the common difference is given by \(\frac{{{l^2} - {a^2}}}{{k - \left( {l + a} \right)}}\) then k = ?
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8
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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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9
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A square is drawn by joining the mid points of the sides of a given square in the same way and this process continues indefinitely. If a side of the first square is 4 cm, determine the sum of the areas all the square.
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10
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The sum of first five multiples of 3 is:
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