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state 1....if x = 6.....x! = 720...tens digit is 2 (prime)....if x = 8 ...x! = tens is 2 (prime)....if x = 10.....x! = tens digit is 0 (not prime) ...insuff

state 2....x can be 5, 6 only x! has 2 in tens digit....which is prime...suff..