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Q)

# Two cards are drawn without replacement from a well shuffled pack of 52 cards. Find the probability that one is spade and other is a queen of red colour.

$(A)\; \frac{1}{52}$
$(B)\;- \frac{1}{51}$
$(C)\; \frac{1}{51}$
$(D)\; -\frac{1}{52}$

Hence required probability is $P (E_1) P(\frac{Q_2}{E_1}) + P (Q_1)P(\frac {E_2}{Q_1})$
$=\frac{13C_1}{52 C_1} \times \frac{2C_1}{51C_1} + \frac{2C_1}{52C_1} \times \frac{13 C_1}{51 C_1}$
$=2 (\frac{13}{52} \times \frac{2}{51})$
$= \frac{1}{51}$