Final answer:
The most likely false statement regarding the advertisements is that neither ad uses humor or the style of Modern Art, as Paul Rand's ads could incorporate these elements, and Saarinen's design aligns with space age and Modern Art influences.
Step-by-step explanation:
The question revolves around identifying which statement is not true for a pair of advertisements possibly related to graphic design trends and specific designers like Eero Saarinen and Paul Rand. Given the context provided, the statement that is NOT true when analyzing these advertisements might be that neither ad uses humor or the style of Modern Art.
This is not a statement we can conclusively address without viewing the actual advertisements being referenced. However, judging by the information given, it's possible that ads from the 1950s, like Rand's designs, did incorporate humor and Modern Art style implicitly or explicitly. It's also worth noting that Saarinen's Tulip Chair reflects the futuristic 'space age,' which opposed traditional aesthetics, hinting at a connection to Modern Art movements.
Taking into account that we are dealing with historical advertisements, statements about the Tulip Chair, attributing design to Saarinen, and Paul Rand designing advertisements are potentially verifiable.
The era discussed, the 1950s, saw a rise in the use of graphic images and simple, recognizable logos, as well as advertisements shifting in nature due to the influence of television. These factors would align with the trend known as 'New Advertising' that emphasized visual simplicity and branding. Thus, this information could confirm the truthfulness of some statements being analyzed.