I'm pretty sure a tank would win no matter how many common infected he's up against. Survivors bashing a tank with guns don't effect him at all, so normal infected punching him with fists would probably do even less.
Yeah I agree, unless all 100 million are punching him at the same time (which is pretty much impossible since there isn't enough space), they wouldn't affect him much at all. He could just punch with a Hulk Smash and they'd die.
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