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How many way can we distribute 9 balls numbered from 1 to 9 in 9 boxes numbered from 1 to 9 such that each box contain exactly one ball and either of the balls with number 1 2 3 are not in boxes 1 2 3. Please help me solve the problem by not using n(AUBUC). Probably by using dearrangments.

Is answering a posted question restricted to a few members? I ask as i don't see a way to do that myself.

time and distance short test 6 last question

F or I or J: "Other countries have already seen the benefit of investing in education and a younger generation, but it is no small step for a country whose majority still live in abject property." Acc to me its an Inference as the stmt derives an inference that it is no small step due to the fact that majority still live in abject property..But the official answer --Judgement

all the natural numbers less than n are written on the blackboard and when one of the number is erased the average of remaining numbers is found out to be 28.what is the erased number????can u please explain in detail???

How do I solve para jumbles?

sum of series of 1+2/4+3/8+4/16+..........can u please elaborate and explain it.i didnt get the solution which is already there in course..

a solid right circular cone is cut into 4 pieces of equal height, with each cut being parallel to its base. If the semi vertical angle of the original cone is 30° what is the ratio of the total surface area of the original cone to the sum of the total surface areas of the 4 pieces?? ans= 12:19.. approach plzz

if log(base2(5x+3y)) + log(base2(5x-3y)) = 10 where x and y are integers, the no of possible values of (x,y) is??? ans = 4.. approach plz

how do i solve para jumbling questions