Find the sum of all 3-digit nos that can be formed by 1, 2 and 3  Choose the correct choice from the following options.
A) 5994 B) 5042 C) 6900 D) 7002 E) 3546
No of such 3-digit nos = 27 (which is Ok)   1st no = 111, Last no = 333 (these r also Ok)   Hence their average = (111 + 333)/2= 
<gadget id="calculator">(111 + 333)/2</gadget>
<output>222</output>
222   (couldn't understand how this formula is applied. I thought this holds true for an 5994P series only)   So, Sum= Number of nos X 5994verage of the nos   = 27 X 222 = 5994 5994NS:5994
<result>A</result>
Find the sum of all 3-digit nos that can be formed by 1, 2 and 3