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The unit digit of the expression : $${25^{6251}} \, + $$ $${36^{528}} \, + $$ $${73^{54}} = ?$$
Answer & Solution
Correct Answer:
Option
D
256251 = 56251 = 5 (because unit digit of 5 is always 5)
36528 = 6528 = 6 (because unit digit of 6 is always 6)
7354 = 354 = 9(unit digit of 354 = 32 ($$\frac{{54}}{4}$$ = 2 remainder) = 9)
now add all the unit digit 5 + 6 + 9 = 20 = 0
36528 = 6528 = 6 (because unit digit of 6 is always 6)
7354 = 354 = 9(unit digit of 354 = 32 ($$\frac{{54}}{4}$$ = 2 remainder) = 9)
now add all the unit digit 5 + 6 + 9 = 20 = 0
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