If an A.P. has a = 1, tn = 20 and sn = 399, then value of n is :
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1
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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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2
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What is the sum of all 3 digit numbers that leave a remainder of '2' when divided by 3?
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3
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Find the nth term of the following sequence :
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4
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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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5
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The sum of first five multiples of 3 is:
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6
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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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7
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If the sums of n terms of two arithmetic progressions are in the ratio \(\frac{{3n + 5}}{{5n + 7}}\) then their nth terms are in the ration
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8
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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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9
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The 7th and 21st terms of an AP are 6 and -22 respectively. Find the 26th term
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10
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If 18, a, b - 3 are in A.P. then a + b =
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