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
Answer (1)
17th Jan, 2024
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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