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If a^2+b^2+c^2=21, and a + b + c = 7, th...

If `a^2+b^2+c^2=21`, and a + b + c = 7, then (ab + bc + ca) is equal to :
यदि`a^2+b^2+c^2=21` है तथा a +b + c = 7 है, तो (ab + bc + ca) का मान क्या होगा ?

A

12

B

28

C

14

D

8

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PINNACLE-ALGEBRA-EXERCISE
  1. If ab+bc+ca=8 and a+b+c=12 then (a^2+b^2+c^2) is equal to: यदि ab+b...

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  2. If (27x^3-343y^3) div (3x-7y)=Ax^2+By^2 +7Cyx, then the value of (4A -...

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  3. If a^2+b^2+c^2=21, and a + b + c = 7, then (ab + bc + ca) is equal to ...

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  4. If (8x^3-27y^3)div (2x-3y)= (Ax^2+Bxy+Cy^2), then the valueof (2A + B ...

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  7. If (x^3-2 sqrt2 y^3) div (x-sqrt2 y)= (Ax^2+Bxy+Cy^2), then, (2A+4 sqr...

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  10. If a^2+b^2+c^2+27= 6(a+b+c), then what is the value of root (3)(a^3+b^...

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  11. If x+1/x= sqrt5, then x^3+1/x^3 is equal to : यदि x+1/x= sqrt5 है, त...

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  12. If x+1/x= 3, then x^3+1/x^3 is equal to : यदि x+1/x= 3 है, तो x^3+1/...

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  13. If a + b + c = 13 and ab + bc + ca = 54 and a^3+b^3+c^3-3abc is equal ...

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  14. If a + b + c = 11 and ab + bc + ca = 38, then a^3+b^3+c^3-3abc is equa...

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  15. If sqrtx+ 1/sqrtx=sqrt 6, then x^2+1/x^2 is equal to: यदि sqrtx+ 1/s...

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  16. If a + b + c = 8 and ab + bc + ca = 12, then a^3+b^3+c^3-3abc is equal...

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  17. If a + b = 5 and ab = 3, then (a^3+b^3) is equal to: यदि a + b = 5 औ...

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  18. If a + b + c = 6 and ab + bc + ca = 4 , then a^3+b^3+c^3-3abc is equal...

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