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If (log)3x=aa n d(log)7x=b , then which...

If `(log)_3x=aa n d(log)_7x=b ,` then which of the following is equal to `(log)_(21)x ?` a.`a b` b. `(a b)/(a^(-1)+b^(-1))` c. `1/(a+b)` d. `1/(a^(-1)+b^(-1)`

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RESONANCE DPP-JEE MAINS-All Questions
  1. (x^2-1)/(2x+5)<3

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  2. If ABCD is a cyclic quadrilateral then find the value of sinA+sinB-sin...

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  3. If (log)3x=aa n d(log)7x=b , then which of the following is equal to ...

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  4. (x^2-1)/(x^2+x+1)<1

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  5. If A=[91,3,9,27),(3,9,27,1),(9,27,1,3),(27,1,3,9)] then det A= (A) 0 (...

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  7. The number of solutions of the system of equations "Re(z^(2))=0, |z|=2...

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  9. The maximum value of f(x) = 2bx^2 - x^4 -3b is g(b), where b gt 0. If ...

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  10. If the sum of the first n natural numbers is 1/5 times the sum of the ...

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  11. The range of the function, f(x)= (1+sec^-1x) (1 + cos^-1 x) is

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  12. यदि y= (1+(1)/(x) )^(x) + x^(1+(1)/(x)) तो (dy)/(dx) का मान ज्ञात की...

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  13. The differential equation for the family of curves y = c\ sinx can be ...

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  14. The area bounded by the x-axis the curve y = f(x) and the lines x = a ...

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  15. Consider the following equation in x and y: (x-2y-1)^2 + (4x+3y-4)^2 +...

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  16. If a, b, c are distinct odd integers and omega is non real cube root o...

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  17. If A is square matrix such that A^2=A , then (I+A)^3-7A is equal to ...

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  18. 1/((a+b)(b+c)(c+a)) |[-2a, a+b, a+c] , [b+a, -2b, b+c] , [c+a, c+b, -2...

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  19. The number of ways of seven digit number with distinct digits of the f...

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  20. a, b, c in R, a!= 0 and the quadratic equationax^2+bx+c=0 has no real ...

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