Question

Does anyone understand how to do this because i didn't learn this and i cant fail this test
Find B union D.
B: {-3, -1, 3, 4, 9, 11}
D: {numbers divisible by 3 from 1 to 15}

{3, 9}

{-3, -1, 3, 4, 9, 11}

{ }

{-3, -1, 3, 4, 6, 9, 11, 12, 15}

Answer 1

in union you have to right all those numbers which are involved in both sets ...and remeber no number is repeated more then once...

Answer 2

still confused

Answer 3

so
B: {-3, -1, 3, 4, 9, 11}
D: {numbers divisible by 3 from 1 to 15}={3,6,9,12,15}
now
BUD={-3,-1,3,4,6,9,11,12,15}

Answer 4

how did you get that

Answer 5

first you get how i write D in this notation..??

Answer 6

not really

Answer 7

you have to take all thoose numbers which can be divide by 3..or in other way which are a factor of 3 from 1 to 15..so those numbers which can be divided by 3 from 1 to 15 are {3,6,9,12,15}

oky get it..?

Answer 8

a little bit

Answer 9

i think i got it thanks

Answer 10

can you help me with one more

Answer 11

you got it fullly..????

Answer 12

yes but i need help with one more

Answer 13

If W = {positive integers} and subset Z = {positive integers divisible by 5}, what is Z'?

{1, 2, 3, 4, ...}

{ }

{5, 10, 15, 20, ...}

{1, 2, 3, 4, 6, 7, 8, 9, 11, 12, 13, 14, 16, ...}

Answer 14

i think its the third one

Answer 15

yes..its C