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Evaluate : sum(i=1)^18 (2^i +3^(i-1))....

Evaluate : `sum_(i=1)^18 (2^i +3^(i-1))`.

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MODERN PUBLICATION-SEQUENCES AND SERIES-EXERCISE
  1. If a,b,c are in A.P. and x,y,z are in G.P., then show that x^(b-c).y(c...

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  2. Evaluate sum(k=1)^11(2+ 3^k).

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  3. Evaluate : sum(i=1)^18 (2^i +3^(i-1)).

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  4. Find the sum to indicated number of terms of the geometric progression...

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  5. Find the sums of the indicated number of terms of the following geomet...

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  6. Find the sums of the indicated number of terms of the following geomet...

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  7. Find the sum to indicated number of terms of the geometric progression...

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  8. Find the sum to indicated number of terms of the geometric progression...

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  9. Find the sum to indicated number of terms of the geometric progression...

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  10. Find the sums of the indicated number of terms of the following geomet...

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  11. How many terms of G.P. 3, 3^2, 3^3, ... are needed to give the sum 120...

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  12. How many terms of a G.P. 3,3/2,3/4,......... are needed to give the su...

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  13. Determine the number n of terms of the G.P. 3,6,12, .......... so that...

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  14. Given a G.P. with a= 1,r= sqrt2. Find S20.

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  15. Given a G.P. with a= 729 and 7th term 64, determine S7.

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  16. If {an} is a G.P. and a1=4,r=5, find a6 and S6.

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  17. Find a G.P. for which sum of the first two terms is -4 and the fifth t...

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  18. The sum of first three terms of a G.P. is 16 and the sum of the next t...

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  19. The sum of some terms of GP. is 315 whose first term and the common ra...

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  20. Find the sum to.n terms of the following series 5+ 55 + 555+………..

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