Which number will best complete the relationship given below?
12 : 30 :: 20 : ?
Pattern followed,
$$({3}\times{3}) + 3$$ = 12
$$({4}\times{4}) + 4$$ = 20
$$({5}\times{5}) + 5$$ = 30
$$({6}\times{6}) + 6$$ = 42
therefore, 42 is the answer.
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