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Let A be the sum of the first 20 terms a...

Let A be the sum of the first 20 terms and B be the sum of the first 40 terms of the series `1^2+2.2^2+3^2+2.4^2+5^2+2.6^2+...` If `B-2A=100lambda` then `lambda` is equal to (1) 232 (2) 248 (3) 464 (4)496

A

248

B

464

C

496

D

232

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DISHA PUBLICATION-SEQUENCES AND SERIES -Exercise -2 : Concept Applicator
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  7. If y=3^(x-1)+3^(-x-1) (where, x is real), then the leastvalue of y is

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  14. If a,b,c and the d are in H.P then find the vlaue of (a^(-2)-d^(-2))/(...

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  16. If (1-p)(1+3x+9x^2+27 x^3+81 x^4+243 x^5)=1-p^6p!=1 , then the value o...

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  18. The sum of the infinite series(2^(2))/(2!) + (2^(4))/(4!) + (2^(6))/(6...

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  19. If a,b,c re in H.Pthen which one of the following is true

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  20. ABC is a right angled triangle in which /B=90^(@) and BC=a. If n point...

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  21. If S(1), S(2), S(3),...,S(n) are the sums of infinite geometric series...

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