4x9=36
OR
XXXVI Roman Numerals
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7 x 4 t 1
1x36, 2x13, 4x9, 20+13. That's a few of them.
You can find a common denominator without factoring but it will not be the least such number. That means that you will end up working with numbers that are far larger than they need be. For example, 5/12 + 7/18 Using LCD = 36: 15/36 + 14/36 = 29/36 Without LCD : 90/216 + 84/216 = 174/216 which can then be simplified to 29/36.
To calculate the number of 12-number combinations using numbers 1-36, we can use the formula for combinations: nCr = n! / r!(n-r)!, where n is the total number of items to choose from (36) and r is the number of items to choose (12). Plugging in the values, we get 36C12 = 36! / 12!(36-12)! = 36! / 12!24! = (363534*...25) / (121110...*1). This simplifies to 125,736,770 unique combinations.
It is: 23+(4*7) = 36.