Interested to Buy Any Domain ? << Click Here >> for more details...
In a class, there are 15 boys and 10 girls. Three students are
selected at random. The probability that 1 girl and 2 boys are
selected, is:
- 2 Answers
- 11294 Views
- I also Faced
- E-Mail Answers
Answer Posted / md.vali hasan
total ways to select three people is 25C3.
2 boys can be selected by 15C2 ways.
1 girl can be selected by 10C1 ways.
so probability of 1 girl and 2 boy are selected is-
15C2*10C1/25C3 = 0.456 .
| Is This Answer Correct ? | 21 Yes | 2 No |
Post New Answer View All Answers
why with the increase of pressure latent heat of steam decreases?
What is the difference between isotropic and anisotropic materials ?
Define convection.
2. Dry saturated steam at 3.5 bar is expanded through a convergent nozzle to 2.2 bar. The exit area is 5 sq. cm. Calculate the exit velocity and mass flow rate, assuming isentropic expansion and super saturated flow. b) A cast iron cylinder head is fastened to a cylinder of 750mm bore with 12 stud bolts. The maximum pressure inside the cylinder is 3 Mpa. The stiffness of part is thrice the stiffness of the bolt. What should be the initial tightening load so that the point is leak proof at maximum pressure? Also choose a suitable bolt for the above application 2 The propeller shaft of a marine engine is to transmit 600 kW at 1200 rpm, without a significant bending. The efficiency of the propeller is 88% at 32 knots ( 1 knot = 1085 km/hr). If the slenderness ratio is less than 50 and the permissible shear stress should not exceed 65 Mpa. Determine the diameter of shaft. 3 A semi-elliptic leaf spring consists of two extra full-length leaves and six graduated length leaves, including the master leaf. Each leaf is 7.2 mm thick and 65 mm wide. The centre-to-centre distance between the two eyes is 1.3m. The leaves are pre-stressed in such a way that when the load is maximum, stress induced in all leaves are equal to 380 N/mm sq. Determine the maximum force that the spring can withstand
what is the meaning of rheostat in maximum and minimum position?
My vendor filled liquid oxygen in our 11000 liter capacity tank. He filled from 1400 MMWC up to 3200 MMWC. I followed the provided conversion table and found that we had been supplied 1800 MMWC liquid which is going to yield 2815 cubic meter. On the other hand, the vendor claims that he supplied as follows:- 5236 cub mtr(3200 MMWC)-2124 cub mtr(1400MMWC) = 3112 cub mtr. I fear that he wants to charge 297 cubic meters extra. He claims that my method was wrong and his was right. He says that this disparity is because of the conical shape of the base of the flask. I will be thankful if somebody can explain me the truth.
what is the three phase induction motor? what is difference between motor used in household instruments and induction motor?
What is welding?
Explain how is martensite structure formed in steel?
The lowest allowable insulation resistance?
What causes crankcase explosion?
In which process internal energy remains constant ?
please send the last 5 years {{{JUNIOR ENGINEER GRADE II - MECHANICAL RRB CHENNAI}}} TECHNICAL question papers
What are the examples of mechanisms?
What is the normal vacuum pressure in a steam turbine atmospheric condenser?
