+1859 Syd chooses two different primes, both of which are greater than 20, and multiplies them. The resulting product is less than 800. How many different products could Syd have ended up with?
+36943 Start with a list of primes > 20
23 29 31 37
23 * 37 is too large
so you have
23 x 29 = 667
23 x 31 = 713
and that's it !
+36943 Start with a list of primes > 20
23 29 31 37
23 * 37 is too large
so you have
23 x 29 = 667
23 x 31 = 713
and that's it !
