The remainder on dividing 1 + 3 + 3^ 2 + 3^ 3 + … + 3^ 2021 by 50 is _____.

JEE Main 2022 Mathematics question

The remainder on dividing + … + by 50 is .

Answer: 4

The sum is ( − 1)/2 = ( − 1)/2 = ( − 1)/2. Expanding (the terms

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Question ID VK-024244