In a group of children, each child exchanges a gift with every other child. If the number of gifts is 132, then the number of children in the group is (a) 10       (b) 11    (c) 12      (d) 13

In a group of children each child gives a gift to every other child. If the number of gifts is 132, find the number of children.

In a group of children ,each child gives a gift to every other child ,If the number of gifts is 132 ,then the number of children are

In a company, each employee gives a gift to every other employee. If the number of gifts is 56, then the number of employees in the company is :

The number of pilgrims in the group is (a) 4 (b) 6 (c) 8 (d) 10

At an annual function of a school each student gives gift to every other student. If the number of gifts is 1980, find the number of students.

At an annual function of a school each student gives gift to every other student. If the number of gifts is 1980, find the number of students.

If the mean of observations is 12 and the sum of the observations is 132, then the value of number of terms is (a) 9 (b) 10 (c)11 (d) 12

Two different families A and B are blessed with equal number of children. There are 3 tickets to be distributed amongst the children of these families so that no child gets more than one ticket. If the probability that all the tickets go to children of the family B is (1)/(12) then the number of children in each family is : (a) 3 (b) 5 (c) 4 (d) 6