*Which of the following is a pair of co-prime numbers?*
1️⃣ 63 and 105
2️⃣ 27 and 45
3️⃣ 91 and 55
4️⃣ 32 and 56
Answers
Answer:
91 and 55
Step-by-step explanation:
The factor of 91 is 7×13 and
the factor of 55 is 5×11
both the factor is prime number
& the common factor 91 and 55 is 1
and the 1 is co-prime number.
I hope this helps you take care dear
SOLUTION
TO CHOOSE THE CORRECT OPTION
Which of the following is a pair of co-prime numbers
1. 63 and 105
2. 27 and 45
3. 91 and 55
4. 32 and 56
CONCEPT TO BE IMPLEMENTED
Co-prime numbers :
Two numbers or integers are co-prime if their common factor is only 1
EVALUATION
CHECKING FOR OPTION : 1
63 = 3 × 3 × 7
105 = 3 × 5 × 7
SO common Factor = 21
So not co-prime
CHECKING FOR OPTION : 2
27 = 3 × 3 × 3
45 = 3 × 3 × 5
Also common Factor of 27 and 45 = 9
So not co-prime
CHECKING FOR OPTION : 3
91 = 7 × 13
55 = 5 × 11
Common factor of 91 and 55 = 1
So co-prime
CHECKING FOR OPTION : 4
32 = 2 × 2 × 2 × 2 × 2
56 = 2 × 2 × 2 × 7
Common factor of 32 and 56 is 8
So not co-prime
FINAL ANSWER
Hence correct option is 3. 91 and 55
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