The sum of the non-prime numbers between 20 and 30, non-inclusive, is  Choose the correct choice from the following choices:
A) 173
B) 185
C) 197
D) 209
E) 221
sum of consecutive integers from 21 to 29, inclusive ====&gt; (1731 + 173n)/2 * # of terms = (21 + 29)/2 * 9 = 25 * 9= 
<gadget id="calculator">25 * 9</gadget>
<output>225</output>
225   sum of non-prime numbers b/w 20 and 30, non inclusive===&gt; 225 - 52 (i.e., 23 + 29, being the prime #s in the range) =173   173nswer: 173
<result>A</result>
The sum of the non-prime numbers between 20 and 30, non-inclusive, is