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Q:

(? × 21 % of 210)÷ (17% of 170) =3087÷?

  • 1
    15
  • 2
    $$ {3\sqrt{2}}$$
  • 3
    $$ {15\sqrt{5}}$$
  • 4
    $$ {17\sqrt{7}}$$
  • 5
    None of these
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Answer : 4. "$$ {17\sqrt{7}}$$"

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