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The HCF and LCM of three numbers are 12 and
[tex] {2}^{3} \times {3}^{2} \times 7[/tex]
respectively. Given that the two numbers are 24 and 36, find the smallest value of the third number.

( I know that the correct answer is 84 but I got 7 and I just want to know why my answer is wrong cause so far the hcf and lcm using 7 is correct?)​