45×21×63=
The problem requires multiplying the fractions , , and .
Step 1: Multiply the numerators.
We have: .
Step 2: Multiply the denominators.
We have: .
Step 3: Form the fraction from results of the two steps above.
The product of these fractions is .
Step 4: Simplify the fraction.
To simplify , we need to find the greatest common divisor (GCD) of 15 and 48. The GCD is 3.
Divide both the numerator and the denominator by their GCD:
.
Thus, the simplified product of the fractions is .
We can compare it against the given answer choices to confirm:
The correct answer choice is Choice 2, .