NUMBER 15
Number between 10 and 20: 11,12,13,14,15,16,17,18,19
Prime number is the number whose only factors 1 and the number itself
11 is prime number because it has 1 and 11 only as its factor
12 is not prime number because not only has 1,12 as its factor, but also 2,3,4,6
13 is prime number because it has 1 and 13 only as its factor
14 is not prime number because not only has 1,14 as its factor, but also 2,7
15 is not prime number because not only has 1,15 as its factor, but also 3,5
16 is not prime number because not only has 1,16 as its factor, but also 2,4,8
17 is prime number because it has 1 and 17 only as its factor
18 is not prime number because not only has 1,18 as its factor, but also 2,3,6,9
19 is prime number because it has 1 and 19 only as its factor
Rylee should name 11,13,17,19
Number 16
14,17,12,15,10,13,8,11
There are two pattern in the sequence
First pattern
14,12,10,8,... (countdown on even numbers)
The next number is 6
Second pattern
17,15,13,11,... (countdown on odd numbers)
The next number is 9
Therefore the next two numbers will be 6,9
The sequence will be 14,17,12,15,10,13,8,11,6,9