यदि P(A) = \(\frac{2}{5}\), P (B) = \(\frac{3}{10}\) और P(A ∩ B) = \(\frac{1}{5}\) है, तो P(A' ∣ B').P(B' ∣ A') किसके बराबर है?

1
\(\frac{5}{6}\)
2
\(\frac{5}{7}\)
3
\(\frac{25}{42}\)
4
1

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