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If x^2+y^2 = 25 and xy = 12, then the va...

If `x^2+y^2 = 25` and xy = 12, then the value of `x^(-1)+y^(-1)` is :

A

`12/5`

B

`7/12`

C

`(-7)/12`

D

both (b) and (c )

Text Solution

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The correct Answer is:
D
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QUANTUM CAT-NUMBER SYSTEM-QUESTION BANK
  1. The remainder obtained when 23^3 + 31^3 is divided by 54 :

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  2. The largest possible number by which the product of any five consecuti...

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  3. If x^2+y^2 = 25 and xy = 12, then the value of x^(-1)+y^(-1) is :

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  4. The remainder when (75^75)^75 is divided by 37 :

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  5. Let p be a prime number strictly greater than 3. Then p^2+17 will leav...

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  6. The unit digit of (12345k)^(72) is 6. The value of k is :

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  7. What is the least number which must be subtracted from 369 to make it ...

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  8. The product of two consecutive even numbers is 624 then one of the num...

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  9. What is the remainder when 1719xx1715xx1713 is divided by 17?

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  10. The quotient 12.5 is divided by 1/6 is :

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  11. Kavita was supposed to multiply a natural number by 23. Instead, she m...

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  12. In a fraction the denominator is 4 greater than numerator. If the nume...

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  13. When the three numbers 104, 221 and 377 are divided by a number we get...

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  14. If (ab^2)^(1//3) = 125 where a > b > 1 and (a , b^2) in N then the cor...

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  15. If a five digit number 'm21 n2" is divisible by 24 then the maximum nu...

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  16. If a fraction is divided by its reciprocal and then mltiplied by itsel...

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  17. A perfect square less than 500 is such that when a prime number p1 is ...

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  18. If (11)^a = (19)^b = (209)^c then the correct relation is:

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  19. The remainder when ('(2)^(54)' -1) is divided by 9 is :

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  20. A number 1 lt N lt 100 is such that it is a perfect square and perfect...

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