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Anonymous
9/4 x 9/5 = 81/20 or 4 and 1/20
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The powers of the primes are: 4, 2, 1 and 1 So the number of divisors are (4+1)*(2+1)*(1+1)*(1+1) = 5*3*2*2 = 60
.4 × .5 = .2 = 1/5
2/5
-5+1= 4 -5 times 1 = -5
1/2