What is the minimum number of people to join into this group so that when they are grouped into 5, none will remain ungrouped ? Without newcomers when they are grouped into 6, 4 of them remain ungrouped and when they are grouped into 9, 7 of then reamin ungrouped.  Choose the correct choice from the following options
A) 2
B) 4
C) 6
D) 8
E) 10
P = 6a+4 = 9b+7   6a= 9b+3 --&gt; min (a,b) = (2,1) so that number of people in this group is   P= 6*2+4= 
<gadget id="calculator">6*2+4</gadget>
<output>16</output>
16   5k= 16 + x so that none will be ungrouped --&gt; min( k) = 4 then     5*4= 
<gadget id="calculator">  5*4</gadget>
<output>20</output>
20 16 + x   X= 4 newcomers should join to this group   ANSWER: 4
<result>B</result>
What is the minimum number of people to join into this group so that when they are grouped into 5, none will remain ungrouped ? Without newcomers when they are grouped into 6, 4 of them remain ungrouped and when they are grouped into 9, 7 of then reamin ungrouped.