Find the perimeter of ELPJ with the given information. If someone could write an explanation that would be awesome.

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How many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.) how many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.)

An of a of 60. a of 36 is . isbe ?to .