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How many ways can you go up a 10 step staircase if you have very long legs and make 1, 2, OR 3 step moves?

 

If you divide 3 to the power of 99 by 7 what is the remainder?

 

Thanks so much for all your help. I always get stuck on these.

 Jul 6, 2018
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3^9, 3^99, 3^999, 3^9999.......etc mod 7 = 6 as the remainder.

 Jul 6, 2018

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