What is the sum of all 3 digit nos formed by {1,3,5,7,9} with nos not repeated
Pick
A) 33300
B) 34500
C) 38500
D) 39800
E) 45200
Here 3 digit no. Can be formed in 5*4*3= 
<gadget id="calculator">5*4*3</gadget>
<output>60</output>
60. Thus we hv to find the sum of 60 nos.   Now  60/5= 
<gadget id="calculator"> 60/5</gadget>
<output>12</output>
12 ; we hv 12 no's. starting with 1 ,12 no's. with 3,5,7,9....   So 12*100*(1+3+5+7+9)+12*10*(1+3+5+7+9)+12*1*(1+3+5+7+9)=30000+3000+300= 
<gadget id="calculator">30000+3000+300</gadget>
<output>33_300</output>
33300   33300NSWER:33300
<result>A</result>
What is the sum of all 3 digit nos formed by {1,3,5,7,9} with nos not repeated