Permutations an...

A point $$(a, b)$$ is called a good point if both $$a$$ and $$b$$ are integers. Number of good points on the curve $$xy$$ $$=$$ $$225$$ are

 In a class there are $$10$$ boys and $$8$$ girls. The teacher wants to select either a boy or a girl to represent the class in a function. The number of ways the teacher can make this selection.

The number of ways in which 7 persons can be arranged around a circle is:

The sum of the value of the digits at the tens place of all the numbers formed with the help of $$3, 4, 5, 6$$ taken all at a time is

Three Men have $$4$$ coats $$5$$ waist Coats, and $$6$$ caps. The number of ways they can wear them is

The points $$A (2, 9), B (a, 5)$$ and $$C (5, 5) $$ are the vertices of a triangle $$ABC$$ right angled at $$B$$. Find the values of  $$a$$ and hence the area of $$\Delta $$ $$ABC$$.

Find the area of triangle having vertices are $$A (3, 1), B (12, 2)$$ and $$C (0, 2)$$.

The area of triangle ABC (in sq. units) is :

The area of a triangle with vertices $$(a, b + c), (b, c + a)$$ and $$(c, a + b)$$ is

Area of the triangle formed by the points P(-1.5, 3), Q(6, -2) and R(-3, 4) is 0.