An algebra problem by Sourasish Karmakar

Algebra Level 3

1+34+3548+3574812+=?\large 1 + \frac34 + \frac{3\cdot 5}{4\cdot 8} + \frac{3\cdot 5\cdot 7}{4\cdot 8\cdot 12} + \cdots = \, ?

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