A grade school class is nearing the final round of musical chairs. 5 students are left and there are 3 chairs available. How many combinations could be made of these 5 students in the 3 chairs?

236 cm 16 time 12 = 192

6 times 7 = 42

192+42

answer: 4  

the square root of 16 is 4. it is a very simple mathematic concept. a square root when a number multiplied by itself will result in a number. here, the number 16 comes when 4 is multiplied by 4. hence the square root of 16 is 4. you can always figure out a square root by the inverse operation of squaring.  

x:       y:  

-1         4

0         4

1         6

2         18

3         20