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The sequence 12,15, 18, 21, 51, 81,... consists of all positive multiples of 3 that contain at least one digit that is a 1. what is the \(80\)th term of this sequence?

 Jan 19, 2022
 #1
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249, just do 12+3*79=249.

 Jan 19, 2022
 #2
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The 80th term should be: 813

 Jan 19, 2022

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