Use mathematical induction to prove the given statement for all positive integers n. 11) 3+ 7+11...

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Use mathematical induction to prove the given statement for all positive integers n. 11) 3+ 7+11 + ... + (4n - 1) = n(2n + 1) 11) 12) 14 + 2.7 + 3 10+ ... + n(3n+ 1) = n(n + 1) 12) Use mathematical induction to prove the given statement for all positive integers n. 11) 3+ 7+11 + ... + (4n - 1) = n(2n + 1) 11) 12) 14 + 2.7 + 3 10+ ... + n(3n+ 1) = n(n + 1) 12)