Difference between revisions of "2021 JMPSC Sprint Problems/Problem 15"
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| − | + | Note that <math>10^{10}\equiv0\pmod{100}</math> and <math>5^{10}\equiv25\pmod{100}</math>. | |
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| + | <math>0-25=-25</math>. <math>-25\equiv\boxed{75}\pmod{100}</math> | ||
Revision as of 08:01, 11 July 2021
Problem
Find the last two digits of 
Solution
Note that 
and 
.
. 
