The value of 2tan²45° + cos²30° + sin²60° is

The mean of first ‘n’ odd natural numbers is . Then n =

The centroid of the triangle whose vertices (1, 4), (-1, -1), (3, -2) is.

A bag contains 3 red balls and 5 black balls. A ball is drawn at random from the bag. What is the probability that the ball drawn is red?

A ladder 15 m long just reaches the top of a vertical wall. If the ladder makes an angle of 60° with the wall, then the height of the wall is