

Second term in an AP is 8 and the 8th term is 2 more than thrice the second term. Find the sum up to 8 terms of this AP.
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If Sn = n3 + n2 + n + 1 , where Sn denotes the sum of the first n terms of a series and tm= 291, then m is equal to?
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Sum of infinite terms of a GP is 12. If the first term is 8, what is the 4th term of this GP?
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Find sum : 22 + 2 * 32 + 3 * 42 + 4 * 52.....10 * 112
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The salaries earned by two friends Anil and Jeetu in different years are in A.P. If the ratio of the amount earned by them in ‘p’ number of years are (4p+1) : (2p+17). Then find the ratio of amount earned by them in the 7th year.
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