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The BCF of 15 and 28 is 1.DON'T ASK WHY.
Oh, dude, it's like this - to convert MMBtu to MCF, you need to know the heat content of the gas in Btu per cubic foot. Then you just divide the number of MMBtu by the heat content to get the equivalent in MCF. It's like converting apples to oranges, but with gas. Easy peasy, right?
1MCF = 1 MMBTU so 130 MCF = 130 MMBTULet me know if you have any confusionUnfortunately, this is incorrect. An MCF of natural gas is a thousand cubic feet; an MMBTU is a million BTU of energy. (The confusion stems from the use of M for thousand, probably from the french mille.) So the correct answer is 130,000 MMBTU.
20: abc, abd, abe, abf, acd, ace, acf, ade, adf, aef, bcd, bce, bcf, bde, bdf, bef, cde, cdf, cef, def.
If you can only take one of each letter, it would be 19: abc, abd, abe, abf, acd, ace,acf,ade,adf,aef, bcd, bce, bcf, bde, bdf, bef, cde, cdf ,def.