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Q:

If $$ {81\ × 343\ ×625}={3^{p}}\ {7^{q}}\ {5^{r}}$$ then find out the value of  $$ {\sqrt{(p-r)^{2}+q^{2}}}$$.

  • 1
    5
  • 2
    3
  • 3
    7
  • 4
    None of these
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Answer : 2. "3"

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