Two cards are drawn at random and without replacement from a pack of 52 playing cards. The probability that both the cards are black (rounded off to three decimal places) is__________

Two cards are drawn at random and without replacement from a pack of 52 playing cards. The probability that both the cards are black (rounded off to three decimal places) is__________

The total width between the two extreme furrow openers in a tractor drawn 9 -row wheat seed drill is $1.6 \mathrm{~m}$. The average mass of wheat seeds dropped per meter of row length in each furrow opener is $2.15 \mathrm{~g}$. Seed rate obtained with the seed drill in $\mathrm{kg} \mathrm{ha}^{-1}$ ( rounded off to one decimal place ) is___________

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