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Answer :
According to the given pattern, we have the third number as the product of the first two numbers and fourth number is obtained after adding 1 to the third number.
\(4^2 + 5^2 + 20^2 = 21^2\)
\(5^2 + 6^2 + 30^2 = 31^2\)
\(6^2 + 7^2 + 42^2 = 43^2\)