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JEE MATHEMATICS MCQ: BINOMIAL THEOREM

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Analyzing +4 | -1
Let (5+26)n=I+f(5+2 \sqrt{6})^n=I+f, where n,I∈Nn, I \in N and 0<f<10 < f < 1, then the value of f2−f+I⋅f−If^2-f+I \cdot f-I, is
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Correct option: B
a negative integer
Option B (a negative integer) is correct because the expression simplifies to -1, which is a negative integer.

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