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The dartboard has nine numbered blocks and 11 unnumbered blocks. Each block measuring 20cm x 20 cm. The number on each block is the score earned when a dart hits that block. A dart, which hits the unnumbered portion of the dartboard, gets a score of zero. Assuming all the 2 darts hit the dartboard, what is the probability of getting a score of seven on the first dart?​

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Answer:

the dart board has nine numbered blocks, each block measuring 20 x 20 cm. the number of each block is the score earned when the dart hits that block. A dart which hits unnumbered portion of the dartboard gets a score of zero. Assuming all darts hits the dartboard, what is the probability of getting a score of 7 with one dart.