The number that dominated the announcement of the Comcast first quarter results was the one that said that pay TV customers had risen for the first time in about 7 years. Comcast had the temerity to say that this was the second quarter running. Here’s the trick the company has pulled, and it genuinely reflects some part of its business, but you have to be aware which part. Where customers where previously billed collectively in an apartment complex, or in healthcare facilities and in other multiple dwelling units (MDUs) they were billed as one customer. Now, where there is a direct billing relationship, they are billed separately. This was explained by CFO Michael Angelakis, who said that ‘beginning this quarter…