Out of 1000 students 658 failed in the aggregate, 166 in the aggregate and in group-1 434 in aggregate and in group-II, 372 in group-I Find out how many failed in all the three. te and in group-II, 372 in group-I, 590 in group-II and 126 in both the groups.

Why is lead placed in group I as well in II?

18 mice were placed in two experimental groups and one control groups with all groups equally large. In how many ways can the mice be placed into three groups ?

Least abundant metal in II A group is

An inquiry into 100 candidates who failed in English of H.S. Examination revealed the following data : failed in Aggregate-66, failed in Paper I-37, failed Paper II-59, failed in Aggregate and Paper I-17, failed in Aggregate and Paper II-43 and failed in both papers-13. Find the number of candidates who failed in (i) Aggregate or Paper II but not in Paper I (ii) Aggregate but not in Paper I and Paper II.