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What is the unit digit of $1^{1} + 2^{2} + 3^{3} + \dots + 1 0^{10}$ ?

Competition practiceNumber System, HCF & LCM

A7
B5
C3
D1

Step-by-Step Solution

Unit digits: 1, 4, 7, 6, 5, 6, 3, 6, 9, 0. Their sum is 47, so the unit digit is 7.

Answer: A) 7

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