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If the first, second and last term of an A.P. are `a ,\ b` and `2a` respectively, its sum is `(a b)/(2(b-a))` (b) `(a b)/(b-a)` (c) `(3a b)/(2(b-a))` (d) none of these

A

`(ab)/(2(b-a))`

B

`(ab)/(b-a)`

C

`(3ab)/(2(b-a))`

D

`(2ab)/(a-b)`

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AAKASH INSTITUTE ENGLISH-SEQUENCES AND SERIES -Assignment (SECTION - A) One option is correct
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  2. about to only mathematics

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  6. The fourth term of the G.P. 4, - 2 , 1 , … is

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  7. Find: n th term of the G.P. sqrt(3),1/(sqrt(3)),1/(3sqrt(3)),

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  8. Which term of the progression 18 ,-12 ,8, i s(512)/(729)?

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  9. The third term of a G.P. is 3. Find the product of its first five term...

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  10. If (a^n+b^n)/(a^(n-1)+b^(n-1))is the A.M. between a and b, then find t...

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  11. If (2p)th term of a G.P is q^2 and (2q)th term is p^2 then (p+q)th ter...

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  12. Three number whose product it 512 are in G.P. If 8 is added to the f...

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  14. Find the sum of first n term of a G.P.1+(1)/(2)+(1)/(4)+(1)/(8)+...

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  15. The n^(th) term of a GP is 128 and the sum of its n terms is 255. If i...

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  16. How many terms of the series 1+3+9+ .. .........sum to 364?

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  17. If the (p+q)^(th) term of a G.P. is a and (p-q)^(th) term is b, determ...

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  18. If the sum of three numbers in a GP. is 26 and the sum of products tak...

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  19. If a,b,c are in G.P then (b-a)/(b-c)+(b+a)/(b+c)=

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  20. If x ,2x+2 and 3x+3 are the first three terms of a G.P., then the four...

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