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Mathematics

196×196×196+204×204×204(196)2+(204)2196×204\dfrac{196 \times 196 \times 196 + 204 \times 204 \times 204}{(196)^2 + (204)^2 - 196 \times 204} is equal to:

  1. 400

  2. -8

  3. 8

  4. none of these

Expansions

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Answer

Given, 196×196×196+204×204×204(196)2+(204)2196×204\dfrac{196 \times 196 \times 196 + 204 \times 204 \times 204}{(196)^2 + (204)^2 - 196 \times 204}

Using the formula, (a3 + b3) = (a + b)(a2 - ab + b2)

1963+2043(196)2+(204)2196×204=(196+204)((196)2+(204)2196×204)(196)2+(204)2196×204=(196+204)=400.\Rightarrow \dfrac{196^3 + 204^3}{(196)^2 + (204)^2 - 196 \times 204}\\[1em] = \dfrac{\Big(196 + 204\Big)\Big((196)^2 + (204)^2 - 196 \times 204\Big)}{(196)^2 + (204)^2 - 196 \times 204}\\[1em] = (196 + 204)\\[1em] = 400.

Hence, option 1 is the correct option.

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