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Which term of the AP : 21, 42, 63, 84, . . . is 210 ?

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Important Questions on Arithmetic Progressions

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10th CBSE
IMPORTANT
If the last term of the AP 5, 3, 1, -1,  is -41, then the AP consists of 
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If k-1, k+1 and 2k+3 are in AP, then the value of k is
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If k+2, 4k-6 and 3k-2 are three consecutive terms of an AP, then the value of k is
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The 21st term of an AP whose first two terms are -3 and 4 is
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If the 2nd term of an AP is 13 and the 5th term is 25, then its 7th term is
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If 7 times the 7th term of an AP is equal to 11 times its 11th  term, then its 18th term will be
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If 18, a, b, -3 are in AP, then a+b=
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If the first term of an AP is -5 and the common difference is 2, then the sum of its first 6 terms is