QBaby story in Rolling Stone
Q stated that the QBaby pic was to be the signifier that 'forces' the Q, which will be answered WWG1WGA. The QBaby post only included the text WWG1WGA. When stated to be well outside the standard deviation, Q replied by noting the date of the 17th and asked for the 17th time, "How many coincidences before mathematically impossible".
17 coincidences (n!17) makes something mathematically impossible.
https://www.rollingstone.com/culture/culture-news/qbaby-qanon-conspiracy-theory-trump-rally-860526/