In a lottery with 30 tickets numbered 1 to 30, two tickets are drawn simultaneously. The probability that at least one of the two tickets drawn is not a prime number is
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a
329
b
529
c
2529
d
2629
answer is D.
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Detailed Solution
1,2,3,.............30⇒n(S)=30c2 P(not a prime)=1−P(prime) =1−10c230c2=2629