यदि ${\log _7}2 = m$ है,तो ${\log _{49}}28$ का मान क्या होगा?

  • A
    $2(1 + 2m)$
  • B
    $\frac{1 + 2m}{2}$
  • C
    $\frac{2}{1 + 2m}$
  • D
    $1 + m$

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