A bag contains 3 red balls, 5 yellow balls and 7 pink balls. If one ball is drawn at random from the bag, what is the probability that it is either pink or red
Total number of balls = 3+5+7 = 15
∴ Probability of either pink or red ball
= 7C1+3C1/15C1
=7+3/15= 10/15 = 2/3
The respective ratio of curved surface area and total surface area of a cylinder is 4:5. If the curved surface area of the cylinder is 1232 cm2. What is the height ?(in cm)
Directions (next five questions) : What will come in place of question mark (?) in the given number series
8 4 6 15 ? 236.25
3 4 9 28 113 ?
320 320 314 290 230 ?
190 94 46 22 ? 4
