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What is the tens digits of 7^{2011}?

 Oct 9, 2021
 #1
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7^0=   01

7^1=   07

7^2=   49

7^3= _43

7^4= _01

7^5= _07

7^6= _ 49

7^7= _43

7^8= _01

etc

Now we have the pattern   07,49,43,01, .........

2011/4 has remainder 3      so it will end in 43

 Oct 9, 2021

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