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Karan looks at the sequence 1, 4, 9, 16 and notices each number is 3 more than the last ne

Karan looks at the sequence 1, 4, 9, 16 and notices each number is 3 more than the last near the start, so he guesses the next number is 19. Diya says you cannot be sure the pattern stays "add 3" without checking more carefully. Who is right?

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