Find the first four terms of the sequence with a recursive formula.
We have a recursive formula here. In a recursive formula, every subsequent term is derived from the previous term. In our case the general recursive formula is:
un = 2 x un-1 – 1 for n ≥ 2
and u1 = 3
We have to find the first four terms, i.e u1, u2, u3 and u4
Put n = 1, u1 = 3
Put n = 2, u2 = 2 x u1 - 1 = 2 x 3 - 1 = 5
Put n = 3, u3 = 2 x u2 - 1 = 2 x 5 - 1 = 9
Put n = 4, u4 = 2 x u...
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