engineering recuitment AAI ATC Junior Executive 2025 Mock Test Series Quantitative Aptitude Simplification Surds and Indices

নীচের সংখ্যাগুলির মধ্যে কোনটি দ্বারা  \(7^{81} + 7^{82} + 7^{83}\) সম্পূর্ণভাবে বিভাজ্য?

1
389
2
399
3
387
4
397
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