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If a,b,c,d are in H.P., then ab+bc+cd is...

If a,b,c,d are in H.P., then ab+bc+cd is equal to

A

3 ad

B

`(a+b)(c+d)`

C

3 ac

D

none of these

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A
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FIITJEE-MATHEMATICS TIPS-ASSIGNMENT -OBJECTIVE
  1. underset(r=1)overset(n)sum ( r )/(r^(4)+r^(2)+1) is equal to

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  2. If lta(n)gtandltb(n)gt be two sequences given by a(n)=(x)^((1)/(2^(n))...

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  3. If a,b,c,d are in H.P., then ab+bc+cd is equal to

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  4. Let A = { 1,3,5,7,9 } and B= { 2,4,6,8 }. An element (a,b) of their ca...

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  5. If A=[i-i-i i]a n dB=[1-1-1 1],t h e nA^8 equals 4B b. 128 B c. -128 B...

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  6. 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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  7. The number of ways in which an examiner can assign 40 marks to 6 quest...

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  8. If a line with direction ratios 2:2:1 intersects the line (x-7)/(3)=(...

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  9. The ratio of lengths of diagonals of the parallelogram constructed on ...

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  10. The number of 4 digit numbers made by using the digits 0, 1, 3, 5, 7, ...

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  11. If a ,1/b ,a n d1/p ,q ,1/r from two arithmetic progressions of the co...

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  12. The maximum area of the triangle formed by the complex coordinates z,...

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  13. If z(1),z(2),z(3) are three complex numbers and A=|{:("arg z"(1),"arg ...

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  14. If in the expansion of 2x+5^(10) , the numerically greatest tem in equ...

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  15. Elements of a matrix A or orddr 10xx10 are defined as a(i j)=w^(i+j) (...

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  16. If one root of the equation z^2-a z+a-1=0i s(1+i),w h e r ea is a comp...

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  17. If A=[{:(p,q),(r,s):}] satisfying equation x^(2)-(p+s)x+lambda=0, then

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  18. If z = 1/3 + (1.3)/(3.6) + (1.3.5)/(3.6.9) + .... then

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  19. Consider the set of equation x+y+xy=35,y+z+yz=8,z+x+zx=3. If z(1),z(2)...

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  20. Let z(1),z(2) be two distinct complex numbers with non-zero real and i...

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