If both the expressions \( x^{1215}-1 \) and \( x^{945}-1 \), are divisible by \( x^{n}-1 \), th...

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If both the expressions \( x^{1215}-1 \) and \( x^{945}-1 \), are divisible by \( x^{n}-1 \), then the greatest integer value of \( n \) is
(a) 135
(b) 270
(c) 945
(d) None of these
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