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Q.

The HCF of any two prime number a and b is


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a

a

b

ab

c

b

d

1 

answer is D.

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Detailed Solution

Highest common factor or HCF of two or more numbers or integers is the highest number by which two or more numbers or integers can be divided by completely.
Now, prime numbers are the natural numbers which can only be divisible by 1 or itself. These numbers are greater than 1.
Now, given prime numbers are a and b.
If they are prime number, then these number can be divisible by 1 which is the highest common factor of both.
Thus, H.C.F. of given prime numbers a and b = 1 Hence, option 4 is the correct answer.
 
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