Question
In how many ways can the letters of the word "EXAMPLE"
be arranged, and what is the probability that all the vowels in these arrangements always appear together?Solution
ATQ;
Word: EXAMPLE Letters: 7 total (E appears twice) Total arrangements: = 7! / 2! = 5040 / 2 = 2520 Vowels together (E, E, A → 1 block): Remaining letters: X, M, P, L → total blocks = 5 - Ways to arrange 5 blocks = 5! = 120 - Ways to arrange vowels (E, E, A) = 3! / 2! = 3 - Total favorable = 120 × 3 = 360 Probability (vowels together): = 360 / 2520 = 1 / 7
Hyperrnetropia or longsight can be corrected by using :
The energy that can harness heat stored below the earth's surface is known as –
Which property of a wave is related to its frequency? Â
The magnetic equator is closely associated with which of the following?
Which of the following is a nonrenewable source of energy? Â
The threshold wavelength for a photoelectric surface is 540 nm. Will a light of energy 2.5 eV cause photoemission?
What is the point called where the total mass of a body is considered to be concentrated?
What is the speed of sound in air at room temperature (approx)? Â
In Newton’s law of cooling, the rate of temperature fall is proportional to:
A body is projected upwards with an initial velocity u . At the highest point, what is its acceleration? Â