senoritace

thanks for the explanation. you showed me a way to narrow down answer choices and doing minimal calculation. thanks.

thanks. I got the solution now. you have explained it nicely. thanks.

If r= - 2 and p (A) 4pr^2 (B) 2pr^3 © -2pr^4 (D) -4pr^5 (E) -6pr^6 The book has given the answer as option D. Please explain.

A five-digit number is formed using digits 1, 3, 5, 7 and 9 without repeating any one of them. What is the sum of all such possible numbers? I know that someone has posted the solution to this but I cant understand it. Can anyone please post the answer by explaining all the details. I have recently started learning permutation and combinations. Please simplify the answer as much as you can. Thank you.

Q: Two thirds of students in a class are boys and rest girls. It is known that the probability of a girl getting a first class is 0.75 and that of a boys is 0.70. Find the probability that a student chosen at random will get first class marks.

1)If P and Q are two points on the line 3x + 4y = -15 such that OP and OQ= 9 units, The area of triangle POQ is given by a) 18* sqrt(2) b) 3* sqrt(2) c) 6* sqrt(2) d) 15*sqrt(2) 2) The equations of two sides of isoceles triangle ABC are x+y=5 and 7x-3y=3 respectively. What will be the length of the intercept cut by the side BC on the y-axis. a) 9/5 b) 8 c) 1.5 d) no unique solution 3) A line is represented by the equation 4x + 5y = 6 in the coordinate system with origin (0,0). You are required to find the equation of the straight line perpendicular to this line that passes through the point (1,-2) [which is in the coordinate system where origin is at (-2,-2)]. a)5x-4y=11 b)5x-4y=13 c)5x-4y=-3 d)5x-4y=7

Heres one more..please answer... Events-----First-----Second------Third 1 ---------A------------C------------ B 2 -------- C------------B-------------A 3 The table above shown the results of the first two events in a competition that involved three teams (A,B,C) and three events(1,2,3). If there are no disqualifications, what is the greatest possible difference in points between the total scores of any two teams after the third event? (A) 15 (B) 10 © 8 (D) 7 (E) 5

hey thanks all for the answers..the answer to the 2nd question was mentioned as 8 squares. got it from some korean tests...

The area of a rectangular garden would be increased by 150 square feet if either the length were increased by 7.5 feet or the width were increased by 5 feet. What is the area of the garden, in square feet? (A) 600 (B) 525 © 375 (D) 300 (E) 225 A square board that has an area of 25 square inches is to be cut into pieces, each of which is a square with sides of length 1, 2, or 3 inches. What is the least number of such square pieces into which the board can be cut? (A) 5 (B) 6 © 7 (D) 8 (E) 9

Any solution explanation to this one.... If a is a positive integer, and if the units’ digit of a^2 is 9 and the units’ digit of (a +1)^2 is 4, what is the units’ digit of (a+2)^2? (A) 1 (B) 3 © 5 (D) 7 (E) 9

found the solution this way 3X + 2Y= 24 Hence, values of X totalling 24 are 0, 2, 4, 6, 8. (oX+12Y, 6X+3Y.....) t has 5 values. Thanks for the replies guys.

In a certain game, a player can accumulate points only by scoring either an X , which counts 3 points, or a Y , which counts 2 points. If a player scored 24 points in the game and t points were made by scoring X ’s how many different values could t have? (A) Four (B) Five © Six (D) Seven (E) Eight An apartment building has 9 floors with 2n apartments per floor. If 1/3 rd of the apartments are to have walls removed to form, in each case, one bigger apartment from two smaller ones, how many apartments will there be after the remodeling? (A) 3n (B) 5n © 6n (D) 12n (E) 415n