All of the following are equal to the value of d EXCEPT

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Since each term in the sequence below is equal to the sum of the two previous terms, d = b + c; e = c + d, since c and d are the two terms previous to e. If e = c + d, then, by subtracting c from both sides of the equation, d = e – c. In the same way, f = d + e, the terms that precede f, and that equation can be rewritten as d = f – e; d = b + c, and c = a + b. Therefore, d = b + (a + b), d = a + 2b. However, d is not equal to e – 2b; d = e – c, and c = a + b, not 2b, since a is not equal to b.

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