Question

last question
In the given figure, circular region.
A represents all integers from 10 to 100 inclusive
B represents all integers that are multiples of 3
C represents all squares of integers
How many numbers are represented by the shaded region?

Answer 1

I am looking for multiples of 3 from 10 to 100

Answer 2

You should be looking for multiples of 3 from 10 to 100 which are not squares of integers

Answer 3

like what? squares of integers is that x^2

Answer 4

13, 16, 19 ........like this?

Answer 5

like, 12,15,18,21,... (without numbers like 36,81,...)

Answer 6

boy am I doing this incorrect......

Answer 7

28 total

Answer 8

Thanks.......

Answer 9

let's see.

minimum number in the set of multipliers of 3 in the range of 10 to 100 is 12(4x3) and maximum is 99(33x3). So there are (33-4)+1=30 numbers that are divisible by 3. Out of them only 81 and 36 are square of an integer. So altogether 30-2=28

I also get 28.