Question

2. Give reasons with suitable examples:
a) Are two coprime numbers always prime numbers.
b) A number divisible by 3 is also divisible by 9.
c) Sum of three odd numbers is always odd.
d) Successor of a three digit number is always a three digit number.
e) 1 is the factor of every number.



plz help me it is very urgent​

Answer 1

Answer:

a) yes, the two co prime no. is always the prime no. because the co prime number is the set of prime numbers .

b) according to the divisibility rule of 3 ...you can study the ncert book of maths class 6 ....

c) because when we ad two odd no. we got an even no. like 7 +3 =10. if again we add an odd number it Will be odd like 10+3=13 .

d) I don't know

e) because every no. is divisible by 1

Answer 2

Step-by-step explanation:

a) Are two coprime numbers always prime numbers. no because co-prime numbers are those numbers whose common factor is 1.

eg. 4,5 ; 16,15

b) A number divisible by 3 is also divisible by 9. no as 9 is first multiple of 9 and it is 3 multiple of 3 and multiples of 9 are found after gap of 9 from that

eg. 3,6

c) Sum of three odd numbers is always odd. yes as sum of two odd no. results in even no. and when a odd no. is added to even no. it results in odd no.

eg. 1+3+5=9, 11+3+13=27

d) Successor of a three digit number is always a three digit number. no as successor of 999 is 1000

e) 1 is the factor of every number.

yes as if we multiply any no. by 1 resulting product is no. itself and it can be multiplied by any no. it will give proper integer.

eg. 1*2=2

555*1=555