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A person writes a letter to four of his friends. He asks each one of them to copy the letter and mail to four different persons with instruction that they move the chain similarly. Assuming that the chain is not broken and that it costs 50 paise to mail one letter. Find the amount spent on the postage when 8th set of letter is mailed.

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The correct Answer is:
Rs. 43690
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NCERT BANGLISH-SEQUENCES AND SERIES-Miscellaneous Exercise On Chapter 9
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  2. Let S be the sum, P the product and R the sum of reciprocals of n term...

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  3. The p^(th), q^(th) and r^(th) terms of an A.P. are a, b, c, respectiv...

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  4. If a(1/b+1/c),b(1/c+1/a),c(1/a+1/b) are in A.P., prove that a,b,c are...

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  5. If a, b, c, d are in G.P, prove that (a^n + b^n), (b^n + c^n), (c^n +...

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  6. If a and b are the roots of x^2 – 3x + p = 0 and c, d are roots of x^...

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  7. The ratio of the A.M. and G.M. of two positive numbers a and b, is m :...

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  8. If a, b, c are in A.P., b, c, d are in G.P. and 1/c,1/d,1/e are in A.P...

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  9. Find the sum of the following series up to n terms: 5+55+555+......

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  10. Find the 20^(th) term of the series 2 xx 4 + 4 xx 6 + 6 xx 8 + ... + ...

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  11. Find the sum of the first n terms of the series: 3+ 7 +13 +21 +31 +......

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  12. If S1, S2, S3 are the sum of first n natural numbers, their squares a...

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  13. Find the sum of the following series up to n terms: 1^3/1+(1^3+2^3)/...

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  14. Show that (1xx2^2+2xx3^2+...+nxx(nxx1)^2)/(1^2xx2+2^2xx3+...+n^2xx(n+1...

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  15. A farmer buys a used tractor for Rs 12000. He pays Rs 6000 cash and ag...

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  16. Shamshad Ali buys a scooter for Rs 22000. He pays Rs 4000 cash and agr...

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  17. A person writes a letter to four of his friends. He asks each one of t...

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  18. A man deposited Rs 10000 in a bank at the rate of 5% simple interest a...

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  19. A manufacturer reckons that the value of a machine, which costs him Rs...

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  20. 150 workers were engaged to finish a job in a certain number of days. ...

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