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Suppose that all the terms of an arithme...

Suppose that all the terms of an arithmetic progression (A.P.) are natural numbers. If the ratio of the sum of the first seven terms to the sum of the first eleven terms is 6: 11 and the seventh term lies in between 130 and 140, then the common difference of this A.P. is

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CENGAGE ENGLISH-SEQUENCES AND SERIES-All Questions
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  2. Let a,b ,c be positive integers such that b/a is an integer. If a,b,c ...

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  9. The sum of 20 terms of a series of which every even term is 2 times ...

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  12. In a G.P. the first, third, and fifth terms may be considered as the ...

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  13. If a,b,c,d be in G.P. show that (b-c)^2+(c-a)^2+(d-b)^2=(a-d)^2.

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  15. A B C is a right-angled triangle in which /B=90^0 and B C=adot If n po...

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