sanjay_dce wrote:another apporach.

total no of possible factors= 144.
total number that has 6 as common factor= 81
so total number of factor that doesn't have 6= 144-81 = 63

different way but the same answer We are told that 4 people have exactly 1 sibling. This would account for 2 sibling relationships (e.g. AB and CD). We are also told that 3 people have exactly 2 siblings. This would account for another 3 sibling relationships (e.g. EF, EG, and FG). Thus, there are 5...

the answer is 12, vertices with coordinates:
(-10,0)
(-8,6)
(-6,8)
(0,10)
(6,8)
(8,6)
(10,0)
(8, -6)
(6, -8)
(0, 10)
(-6, -8)
(-8, -6)

There are 12 different ways to draw ab, and so there are 12 ways to draw abcd.

Coordinate plane

A certain square is to be drawn on a coordinate plane. One of the vertices must be on the origin, and the square is to have an area of 100. If all coordinates of the vertices must be integers, how many different ways can this square be drawn?
4
6
8
10
12 :roll:

PROB ability....

In a room filled with 7 people, 4 people have exactly 1 sibling in the room and 3 people have exactly 2 siblings in the room. If two individuals are selected from the room at random, what is the probability that those two individuals are NOT siblings?
5/21
3/7
4/7
5/7
16/21

Here is another one thank u in advance!
For which of the following functions is f(a+b) = f(a) + f(b) for all positive numbers a and b?
f(x)=x2
f(x)=x+1
f(x)=√x
f(x)=2/x
f(x)=-3x

Function f(n)

GMAT GURUs! Please help me:) The function f is defined for all positive integers n by the following rule: f(n) is the number of positive integers each of which is less than n and has no positive factor in common with n other than 1. If p is any prime number then f(p)= A. p-1 B. p-2 C. (p+1)/2 D. (p...