Answer:
3: 6,9,12,15,18,21 and 24.
7: 14,21,28,35,42,49 and 56.
5: 10,15,20,25,30,35 and 40.
9: 18,27,36,45,54,63 and 72
4: 8,12,16,20,24,28 and 32.
Step-by-step explanation:
Given are the number at the beginning of each strings.
We need to write multiples of number on first light of string on rest of lights on the string.
3: ![3\times 1= 3 (given)](https://tex.z-dn.net/?f=3%5Ctimes%201%3D%203%20%28given%29)
![3\times 2= 6\\3\times 3= 9\\3\times 4= 12\\3\times 5= 15\\3\times 6= 18\\3\times 7= 21\\3\times 8= 24](https://tex.z-dn.net/?f=3%5Ctimes%202%3D%206%5C%5C3%5Ctimes%203%3D%209%5C%5C3%5Ctimes%204%3D%2012%5C%5C3%5Ctimes%205%3D%2015%5C%5C3%5Ctimes%206%3D%2018%5C%5C3%5Ctimes%207%3D%2021%5C%5C3%5Ctimes%208%3D%2024)
7: ![7\times 1= 7 (given)](https://tex.z-dn.net/?f=7%5Ctimes%201%3D%207%20%28given%29)
![7\times 2= 14\\7\times 3= 21\\7\times 4= 28\\7\times 5= 35\\7\times 6= 42\\7\times 7= 49\\7\times 8= 56](https://tex.z-dn.net/?f=7%5Ctimes%202%3D%2014%5C%5C7%5Ctimes%203%3D%2021%5C%5C7%5Ctimes%204%3D%2028%5C%5C7%5Ctimes%205%3D%2035%5C%5C7%5Ctimes%206%3D%2042%5C%5C7%5Ctimes%207%3D%2049%5C%5C7%5Ctimes%208%3D%2056)
5: ![5\times 1= 5 (given)](https://tex.z-dn.net/?f=5%5Ctimes%201%3D%205%20%28given%29)
![5\times 2= 10\\5\times 3= 15\\5\times 4= 20\\5\times 5= 25\\5\times 6= 30\\5\times 7= 35\\5\times 8= 40](https://tex.z-dn.net/?f=5%5Ctimes%202%3D%2010%5C%5C5%5Ctimes%203%3D%2015%5C%5C5%5Ctimes%204%3D%2020%5C%5C5%5Ctimes%205%3D%2025%5C%5C5%5Ctimes%206%3D%2030%5C%5C5%5Ctimes%207%3D%2035%5C%5C5%5Ctimes%208%3D%2040)
9: ![9\times 1= 9 (given)](https://tex.z-dn.net/?f=9%5Ctimes%201%3D%209%20%28given%29)
![9\times 2= 18\\9\times 3= 27\\9\times 4= 36\\9\times 5= 45\\9\times 6= 54\\9\times 7= 63\\9\times 8= 72](https://tex.z-dn.net/?f=9%5Ctimes%202%3D%2018%5C%5C9%5Ctimes%203%3D%2027%5C%5C9%5Ctimes%204%3D%2036%5C%5C9%5Ctimes%205%3D%2045%5C%5C9%5Ctimes%206%3D%2054%5C%5C9%5Ctimes%207%3D%2063%5C%5C9%5Ctimes%208%3D%2072)
4: ![4\times 1= 4 (given)](https://tex.z-dn.net/?f=4%5Ctimes%201%3D%204%20%28given%29)
![4\times 2= 8\\4\times 3= 12\\4\times 4= 16\\4\times 5= 20\\4\times 6= 24\\4\times 7= 28\\4\times 8= 32](https://tex.z-dn.net/?f=4%5Ctimes%202%3D%208%5C%5C4%5Ctimes%203%3D%2012%5C%5C4%5Ctimes%204%3D%2016%5C%5C4%5Ctimes%205%3D%2020%5C%5C4%5Ctimes%206%3D%2024%5C%5C4%5Ctimes%207%3D%2028%5C%5C4%5Ctimes%208%3D%2032)