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03-09-2017
Mathematics

contestada

How many 3 digit positive integers are odd and do not contain the digit 5?

Respuesta :

03-09-2017

Hello,
Assume n=a*100+b*10+c un integer positive odd with no 5.

a∈{1,2,3,4,6,7,8,9} ,#8
b∈{0,1,2,3,4,6,7,8,9},#9
c∈{1,3,7,9},#4
Number of integers searched: 8*9*4=288

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