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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1
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If the nth term of an A.P. is 2n + 1, then the sum of first n terms of the A.P. is
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2
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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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3
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The nth term of an A.P., the sum of whose n terms is Sn, is
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4
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If a, b, c are in A.P., then (a – c)2/ (b2 – ac) =
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5
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What is the sum of the first 11 terms of an arithmetic progression if the 3rd term is -1 and the 8th term is 19?
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6
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The sum of first five multiples of 3 is:
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7
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The 3rd and 7th term of an arithmetic progression are -9 and 11 respectively. What is the 15th term?
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8
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If the sum of three consecutive terms of an increasing A.P. is 51 and the product of the first and third of these terms is 273, then the third term is :
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9
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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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10
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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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