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number theory

GATE Electronics & Communication · Permutations and Combinations · 2020-2024

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The greatest prime factor of (3^199 – 3^196) is

The number of 4-digit numbers formed by using the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 such that the product of the digits is 0 is ______.