Permutation and combination
1. Number of selections of atleast 10 articles from 19 different articles is.
A) 2^19 B) 2^18 C) 2^19 - 1 D) 2^18 - 1 E) None
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There were 90 questions in an exam. If 1 mark was awarded for every correct answer and 1/3rd mark was deducted for every wrong answer, how many different net scores were possible in the exam?
How many different size squares are there in a square grid of five by seven?
What is the sum of all the four digit numbers made using the digits 1,2,3,4 (with as well as without repetition)?
how many pairs of divisors of 21600 will have h.c.f 6..?
Please share the solution to the problem below:
In all the words formed by the letters of the word RAINBOW are arranged in a dictionary form, then what is the position of the word RAINBOW in that dictionary
In how many ways can you select exactly 7 letters from 3A, 4B, 2C and 1D?
HI SIR, could you please explain this question? P.S- I did not understand it from the solution given in the mock.
Two cards are randomly selected from a well-shuffled deck of 52 playing cards. Find the probability that one of them is a Queen and the other is a black card.
Sir could you please explain the solution after a+b+c=15
how many pairs of x and y are possible if
Four circular tables are arranged such that their centers from a square. If each table can accommodate 4 persons, in how many ways can 16 people be selected across such an arrangement?
Sir, I have a doubt in this question. I agree that for the 1st person, all the tables are alike so he can select any one table in 1 way. After that, why are there 4 different ways for him to be seated at that table? Aren't the chairs on that particular table too alike for him? So shouldn't the ways of selecting the chair be 1 instead of 4? Please clarify.
A box contains 5 chips, numbered from 1,2,3,4 and 5. Chips are drawn randomly one at a time without replacement until the sum of the values drawn exceeds 4. What is the probability that 3 draws are required?