Answer:
13 fans shall receive all the 3 items
Step-by-step explanation:
It shall be those fans which are L.C.M of 75,30,50 in the range less than 4000
L.C.M of 75,30,50 are 300,600,900,1200,1500,1800,2100,2400,2700,3000,3300,3600,3900
Thus the number of fans that receive all the three items are 13