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81 = 34; 126 = 2 x 32 x 7. LCM = 34 x 2 x 7 = 1134.
Note: Highest common factor is 3 x 3 ie 9. LCM of two numbers = product divided by HCF, in this case 81 x 126/9 = 9 x 126 = 1134.
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