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The number of the positive integral solu...

The number of the positive integral solutions `(x,y, z)` of the equation xyz = 24 is t, then the number of all possible factors of t is

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To solve the problem of finding the number of positive integral solutions \((x, y, z)\) of the equation \(xyz = 24\) and then determining the number of factors of \(t\), we can follow these steps: ### Step 1: Factorization of 24 First, we need to factor the number 24 into its prime factors: \[ 24 = 2^3 \times 3^1 \] ### Step 2: Finding the Number of Positive Integral Solutions To find the number of positive integral solutions to the equation \(xyz = 24\), we can use the stars and bars combinatorial method. We need to distribute the exponents of the prime factors among \(x\), \(y\), and \(z\). Let: - \(x = 2^{a_1} \times 3^{b_1}\) - \(y = 2^{a_2} \times 3^{b_2}\) - \(z = 2^{a_3} \times 3^{b_3}\) From the equation \(xyz = 24\), we have: \[ a_1 + a_2 + a_3 = 3 \quad \text{(for the factor of 2)} \] \[ b_1 + b_2 + b_3 = 1 \quad \text{(for the factor of 3)} \] #### Step 2.1: Solving for \(a_1 + a_2 + a_3 = 3\) Using the stars and bars method, the number of non-negative integer solutions to the equation \(a_1 + a_2 + a_3 = 3\) is given by: \[ \binom{3 + 3 - 1}{3 - 1} = \binom{5}{2} = 10 \] #### Step 2.2: Solving for \(b_1 + b_2 + b_3 = 1\) Similarly, for the equation \(b_1 + b_2 + b_3 = 1\), the number of non-negative integer solutions is: \[ \binom{1 + 3 - 1}{3 - 1} = \binom{3}{2} = 3 \] ### Step 3: Total Positive Integral Solutions The total number of positive integral solutions \(t\) is the product of the solutions for \(a\) and \(b\): \[ t = 10 \times 3 = 30 \] ### Step 4: Finding the Number of Factors of \(t\) Next, we need to find the number of factors of \(t = 30\). First, we factor 30 into its prime factors: \[ 30 = 2^1 \times 3^1 \times 5^1 \] The formula for finding the number of factors from the prime factorization is: \[ (\text{exponent of } p_1 + 1)(\text{exponent of } p_2 + 1)(\text{exponent of } p_3 + 1) \] Applying this to our factorization: \[ (1 + 1)(1 + 1)(1 + 1) = 2 \times 2 \times 2 = 8 \] ### Final Answer Thus, the number of all possible factors of \(t\) is: \[ \boxed{8} \]
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