Question : The units digit of the expression $25^{6251} + 36^{528} + 73^{54}$ is:
Option 1: 6
Option 2: 5
Option 3: 4
Option 4: 0
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Correct Answer: 0
Solution : Given: $25^{6251} + 36^{528} + 73^{54}$ Units digit of $25^{6251} = 5$ Units digit of $36^{528} = 6$ Units digit of $73^{54} = 3^{4 \times13 + 2} = 9$ The sum of the unit digits = 5 + 6 + 9 = 20 So, 0 is the unit digit of the above expression. Hence, the correct answer is 0.
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