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avatar+1479 

Syd chooses two different primes, and multiplies them.  If both primes are greater than $20$, and the resulting product is less than $2000$, then how many different products could Syd have ended up with?

 Dec 29, 2023
 #1
avatar+126665 
+1

(23, 29, 31, 37, 41, 43, 47)

 

He could choose any  pair except the last two

 

So

 

C(7,2)  - 1  =   20  different  products

 

cool cool cool

 Dec 29, 2023

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