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If a + 1/a = 3, then the value of a^3 + ...

If `a + 1/a = 3`, then the value of `a^3 + 1/(a^3)` is :

A

15

B

18

C

27

D

none of these

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The correct Answer is:
B
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QUANTUM CAT-NUMBER SYSTEM-QUESTION BANK
  1. If (64)^2 - (36)^2 = 20 k then the value of k is :

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  2. If a+1/a=4. then the value of a^2+1/a^2 is :

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  3. If a + 1/a = 3, then the value of a^3 + 1/(a^3) is :

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  4. What is the value of (2.75xx2.75xx2.75-2.25xx2.25xx2.25)/(2.75xx2.75...

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  5. If (sqrta+sqrtb)=17 and (sqrta-sqrtb)=1, then the value of sqrtab is :

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  6. Find the value of a^3+b^3+c^3-3abc if a+b+c=12 and ab +bc +ca=47.

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  7. If a + b + c = 0 , then the value of a^3 + b^3 + c^3 is :

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  8. If x+y+z=0, then the value of (x^2y^2+y^2z^2+z^2x^2)/(x^4+y^4+z^4) is...

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  9. The value of a^3+b^3+c^3-3abc, when a =87, b = -126 and c=39 is :

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  10. The greatest divisor of (a-b)(a+b)(a^2+b^2)(a^4+b^4)(a^8+b^8)(a^16+b^...

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  11. In the above example which of the following can not divide given expre...

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  12. The expression 31^n+17^n is divisible by for every odd positive intege...

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  13. Which is not the factor of 4^(6n)-6^(4n) for any positive integer n?

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  14. 19^(n) - 1 is

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  15. Find the remainder when 38 + 71 + 85 is divided by 16.

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  16. Find the remainder when 1661 + 1551 + 1441 + 1331 + 1221 is divided ...

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  17. What is the remainder when 678 + 687 + 6879 + 6890 is divided by 17 ...

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  18. What is the remainder when (10 + 10^2 + 10^3 + 10^4 + 10^5) is divided...

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  19. Find the remainder when 123 xx 1234 is divided by 15.

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  20. Find the remainder when 1719 xx 1721 xx 1723 xx 1725 xx 1727 is divide...

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