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avatar+253 

How many integers between 100 and 500 have at least two 3s as digits?

 Jun 22, 2020
 #1
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13 = 133, 233, 330, 331, 332, 333, 334, 335, 336, 337, 338, 339, 433.

 Jun 22, 2020
 #2
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there is way more

303,323,343,353,363,373,383,393

so the answer is 18+3=21

 Jun 22, 2020

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