Hi , i would appreciate if someone could wrote his way of solving the following:
1. If x*y+z = x(y+z), which must be true?
a. x=0 z=0
b. X=1 y=1
c. x=1 z=0
i could find out that x=1 but i cant really get to z=0( the answer is c.). I mean if you solve the equation one gets...z=x*z -->this leads to x =1 but why to Z=0????
2. DS question: If X and Y are positiv integers, what is the value of xy.
a. the greatest common factor is10
b. the least common multiple is 180
can so pls show his calculations here?
3. A certain company has 6 senior and 4 junior officers. If a committee is created out of 3 senior and 1 junior, how many different committees are possible.
here it would be nice if so. could also generally suggest some godd resources to learn probability questions. I thought at first that i had to calculate 6*5*4 for the senior and than take this times 4 as there are four possibilities on the one seat of the junior. But obviously this is wrong.
HMMMM i hate probability...
thxxx
1. If x*y+z = x(y+z), which must be true?
a. x=0 z=0
b. X=1 y=1
c. x=1 z=0
i could find out that x=1 but i cant really get to z=0( the answer is c.). I mean if you solve the equation one gets...z=x*z -->this leads to x =1 but why to Z=0????
2. DS question: If X and Y are positiv integers, what is the value of xy.
a. the greatest common factor is10
b. the least common multiple is 180
can so pls show his calculations here?
3. A certain company has 6 senior and 4 junior officers. If a committee is created out of 3 senior and 1 junior, how many different committees are possible.
here it would be nice if so. could also generally suggest some godd resources to learn probability questions. I thought at first that i had to calculate 6*5*4 for the senior and than take this times 4 as there are four possibilities on the one seat of the junior. But obviously this is wrong.
HMMMM i hate probability...
thxxx
