Point out which of the following groups of numbers are coprime (1) 3 and 4; (2) 4 and 6; (3) 6 and 1; (4) 15 and 16; (5) 18 and 20; (6) 19 and 24; (7) 24 and 25; (8) 49 and 50 Come on, I'll give you a reward!

Point out which of the following groups of numbers are coprime (1) 3 and 4; (2) 4 and 6; (3) 6 and 1; (4) 15 and 16; (5) 18 and 20; (6) 19 and 24; (7) 24 and 25; (8) 49 and 50 Come on, I'll give you a reward!

1 3 4 6 7 8

Among prime numbers within 20, the sum of two prime numbers is the common group of prime numbers
A. 2B. 3C. 4D. 5

The prime numbers in 20 are: 2, 3, 5, 7, 11, 13, 17, 19; among them, 2 + 3 = 52 + 5 = 72 + 11 = 132 + 17 = 19 are 4 groups

Among prime numbers within 20, the sum of two prime numbers is the common group of prime numbers
A. 2B. 3C. 4D. 5

The prime numbers in 20 are: 2, 3, 5, 7, 11, 13, 17, 19; among them, 2 + 3 = 52 + 5 = 72 + 11 = 132 + 17 = 19 are 4 groups

The sum of the two prime numbers is 10 and the product is 21. The two prime numbers are () and (), respectively

3 7

The numbers on a and B are prime numbers. Their sum is 10 and their product is 21?
The numbers on C and D are combined. Their sum is 10 and their product is 24. What are they?
The numbers on B and C are prime numbers. Their product is 28 and the difference is 3?
The last question: B and C are two cards, one is prime number, the other is composite number, their product is 28, the difference is 3, what are they?

a=3,b=7,c=4,d=6
Is the last question wrong?

There are two prime numbers. The sum of us is 10. The product of us is 21

3 and 7

In a scale, two inner terms are prime numbers, and their product is 21

In a ratio, two internal terms are prime numbers, and their product is 21. It is known that one external term is three out of eleven. This ratio can be written as ()
77:3 = 7:3

Given that the sum of two prime numbers is 49, what is the product of the two prime numbers?
Urgent!

The sum of two prime numbers is 49, and bit 9 can be 0 + 9,1 + 8.2 + 7,3 + 6,4 + 5. Except that 2 and 7 are prime numbers, the rest will not be prime numbers at the same time. Therefore, we can infer that these two prime numbers are 2 and 47 respectively, so their product is 94

There are two prime numbers whose sum is 10 and product is 21. These two prime numbers are______ 、______ ．

21 = 3 × 73 + 7 = 10, that is, the two prime numbers are 3 and 7 respectively

Put the proper prime number in the brackets
26=( )+( ) =( )+( ) =( )+( )
12= ( )+( ) =（ ）-（ ） =（ ）×（ ）×（ ）

26=13+13=3+23=7+19=9+17
12=5+7=17-5=2*2*3