



 
Well, calculators aside, you can do some quick arithmetic as follows by using multiples of 23 like 230, 2300, etc. 2300230 =2070 is clearly a multiple of 23 so what would the remainder be if we divided (20702050)*(20702071)*(20702095) = 20*(1)*(25) by 23 and how would this relate to your question? (You could simplify even further by looking at (3)*(1)*(2) instead of 20*(1)*(25); why?). I think your answer should be 17. What is really going on here is the idea behind modular arithmetic, hope this helps, Penny  


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