Monday, July 25, 2016

elementary number theory - Find the last two digits of 22156789

Find the last two digits of 22156789.




My try:



As 2156789=4539197+1
The unit digit of 22156789 is similar to the unit digit of 24n+1 which is equal to 2.
But I'm unable to find the tens digit. Please help me.

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