Question

The ratio of even numbers to odd number in a set of natural numbers from 1 to 15 is what

Answer 1

Answer:

Step-by-step explanation:

(a) number of even numbers to odd numbers from set of natural numbers from 30 to 50?

(b) prime numbers and composite numbers from set of natural numbers from 1 to 20?

Tσ fínd :

The ratio of :–

Number of even and odd numbers

Number of prime numbers

Sσlutíσn :

Odd and even numbers from 30–50.

To count the numbers fast, use this:

30+50=80

32+48=80

34+46=80

And so on and the result will be 80x5 PLUS the 40 in the middle which equals 440.

And the odd numbers

31+49=80

33+47=80

And so on and the result will be 80x5 which equals 400

Odd : Even = 440:400

:

We get 11:10.

Prime Numbers from 1 to 20: 2, 3, 5, 7, 11, 13, 17, 19

No. of Prime Numbers from 1 to 20 = 8

Composite Numbers from 1 to 20: 1, 4, 6, 8, 9, 10, 12, 14, 15, 16, 18

No. of Composite Numbers from 1 to 20 = 11

The Number of Prime numbers and composite numbers from set of natural numbers from 1 to 20 =

Required Ratio = 8:11