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The 21st term of the A.P. whose first two terms are -3 and 4 is

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Important Questions on Arithmetic Progressions

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If the 2nd term of an A.P. is 13 and 5th term is 25, what is its 7th term?
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Which term of the A.P., 21, 42, 63, 84, is 210?
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If the common difference of an A.P. is 5, then what is a18-a13?
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What is the common difference of an A.P. in which a18-a14=32?
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Two A.P.s have the same common difference. The first term of one of these is -1 and that of the other is -8. Then the difference between their 4th terms is
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If 7 times the 7th term of an A.P. is equal to 11 times its 11th term, then its 18th term will be:
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The 4th term from the end of the A.P., -11, -8, -5, ....,49 is
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The famous mathematician associated with finding the sum of the first 100 natural numbers is