Sir please upload video for all the sums..
Please sir it is very useful...
If u explain we can solve it easily....
Thank u sir
How many grams of hydrogen molecules are present in 20 gram hydrogen?
if U= 1 2 3 4 5 6 7 8 9 8 A= 2 4 6 8 B= 2357 verify that (AUB)=A'UB'