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The #n^(th# term of a sequence is given by 2n+3
(a) Write down the first four terms of the sequence.
(b) Find S₅₀,the sum of the first fifty terms of the sequence.
(c) Show that the sum of the first n terms of the sequence is given by S_n=#n^2#+4n.Hence or otherwise find the largest integral value of n such that S_n<725