Box contains 2 one rupee, 2 five rupee, 2 ten rupee and 2 twenty rupee coin. Two coins are drawn at random simultaneously. The probability that their sum is Rs. 20 or more, is
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answer is 0.5.
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Detailed Solution
Let A be the event such that sum is Rs. 20 or more P(1)=1−P( Total value is <20)=1− 6C2−2C2 8C2=1−1428=1−12=12