About 14 billion.
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84. Express the numbers in their prime factorisation in power form: 7 = 7 12 = 22 x 3 14 = 2 x 7 For LCM multiply together the highest power of the primes across all the numbers: LCM = 22 x 3 x 7 = 84
7:12 or 7 to 12
7 and 12 7 + 12 = 19
7 to the tenth power divided by 7 to the ninth power = 1
7 to the power of 8