A coin is tossed if head turns up then pair of dice is thrown and sum of numbers is noted. If tail turns up then a card numbered from 1 to 9 is drawn and number is noted, then find the probability that number is $7\text{or}8$. (a) $\frac{13}{36}$ (b) $\frac{15}{72}$ (c) $\frac{19}{72}$ (d) $\frac{11}{36}$

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