You are dividing each number by 3 every time. Therefore, after 18 comes 18/3 = 6.
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162 486 1458 4734 and so on just multiply number by 3
LCM(18, 54, 81) = 162
162, 486, 1458
The factors of 162 are 1, 2, 3, 6, 9, 18, 27, 54, 81, and 162.
To find the common ration in a geometric sequence, divide one term by its preceding term: r = -18 ÷ 6 = -3 r = 54 ÷ -18 = -3 r = -162 ÷ 54 = -3