Quant group 3 flashcard quiz

GRE Quant Problem Solving
1

quant group 3 flashcard quiz q3. like we have divided by 4 to get 76. what if we divide be 7 directly. is there something i am missing. thru my method i am getting 3 as remainder

2

Is this the question you’re referring to?

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3

Yes i am referring to this

4

So we’re dividing by 4 to find the unit digit of 7^{77} right?