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If a ,b ,c are in A.P., the a/(b c),1/c ...

If `a ,b ,c` are in A.P., the `a/(b c),1/c ,1/b` will be in a. A.P b. G.P. c. H.P. d. none of these

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CENGAGE ENGLISH-SEQUENCES AND SERIES-All Questions
  1. If a ,b ,a n dc are in H.P., then th value of ((a c+a b-b c)(a b+b c-a...

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  2. If a1, a2, a3, an are in H.P. and f(k)=(sum(r=1)^n ar)-ak ,t h e n (a...

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  3. If a ,b ,c are in A.P., the a/(b c),1/c ,1/b will be in a. A.P b. G.P....

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  4. Let a+a r1+a r1 2++ooa n da+a r2+a r2 2++oo be two infinite series of ...

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  5. The coefficient of the quadratic equation a x^2+(a+d)x+(a+2d)=0 are co...

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  6. Let S denote sum of the series 3/(2^3)+4/(2^4 .3)+5/(2^6 .3)+6/(2^7 .5...

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  7. Let the sum of first three terms of G.P. with real terms be 13/12 and ...

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  8. Given a,b,c are in A.P.,b,c,d are in G.P and c,d,e are in H.P .If a=2 ...

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  9. The terms a1,a2,a3 form an arithmetic sequence whose sum is 18.The ter...

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  10. Let f(x)=2x+1. Then the number of real number of real values of x for ...

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  11. Concentric circles of radii 1,2,3,. . . . ,100 c m are drawn. The inte...

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  12. Let {tn} be a sequence of integers in G.P. in which t4: t6=1:4 and t2+...

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  13. If x ,2y ,3z are in A.P., where the distinct numbers x ,y ,z are in G....

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  14. If Sp denotes the sum of the series 1+r^p+r^(2p)+ toooa n dsp the sum ...

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  15. If x ,y ,z are real and 4x^2+9y^2+16 z^2-6x y-12 y z-8z x=0,t h e nx ,...

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  16. If a1, a2, ,an are in H.P., then (a1)/(a2+a3++an),(a2)/(a1+a3++an), ...

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  17. If H1, H2, ,H(20) are 20 harmonic means between 2 and 3, then (H1+2)/...

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  18. A pack contains n cards numbered from 1 to n. Two consecutive numbered...

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  19. Let an=16 ,4,1, be a geometric sequence. Define Pn as the product o...

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  20. If he equation x^3+a x^2+b x+216=0 has three real roots in G.P., then ...

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