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If mathamatically then2 and if  logically then its 11. u can calculate it by measuring 7, 45 times.

1 5 1
The all powers of 7 is and it contains the last values as 7,9,3,1 so the by taking the power % 4 we get 1 so the last power of 7^45 is 1. The 4 comes from the 4 values of powers of 7. i dont know in what way your asking 1+1= anyway it is by math 2
2 5 2
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