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There are three possible pairs, i.e. ST, NT and, GI.
The average of 11 observations is 60. If the average of first five observations is 58 and that of last five is 56, the sixth observation is
The average age of a class of 17 girls is 12 years. If 3 new girls having average age of 8 years join the class, then the average age of the class becomes: