Question: Fill in the missing character ? to match the rules of numbers and alphabetical sequence 19. 479658, 915187109, 178611788815, ? 20. 5123, ?, 1512, 215,

Fill in the missing character "?" to match the rules of numbers and alphabetical sequence

19. 479658, 915187109, 178611788815, ?

20. 5123, ?, 1512, 215, 51

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