+0  
 
+7
75
3
avatar+559 

How many prime numbers less than 100 have a units digit of 3?

 Dec 21, 2022
 #1
avatar+105 
+2

EASY...

 

While there's no formula to actually do this math, we can just write it out:

13, 23, 43, 53, 73, 83

So there are 6 primes!

 Dec 21, 2022
 #2
avatar+118196 
+1

I think you forgot 3 tooeasy :)

Melody  Dec 22, 2022
 #3
avatar+105 
+2

OH MY GOD... Sorry about that, looks like I forgot one.

TooEasy  Dec 28, 2022

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