Question

From the set(2,3,4,5,6,7,8,9) how many co prime can be formed

Answer 1

Answer:

Ans is 4,6,8,9 are the co prime numbers

Answer 2

First, lets us know what is a coprime

-Two natural numbers are said to be co-prime if they have no common factor other than 1.

Example:

6 and 25

Factors of 6=  1   ,  2  ,  3  ,  6

Factors of 25= 1   ,  5  ,  25

1 is the only common factor of 6 and 25.

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(2, 3), (2, 5), (2, 7), (2, 9), (3, 4), (3, 5), (3, 7), (3, 8), (4, 5), (4, 7), (4, 9), (5, 6), (5, 7), (5, 8), (5, 9), (6, 7), (7, 8), (7, 9), (8, 9)

These are in all 19 pairs given above(ANSWERS)

Now, if u will look at the pairs, they only have the common factor i.e. 1.

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