Which of the options below gives a pair of co-prime numbers?

Question

Question

This question was previously asked in

RRB Group D 26 Sept 2022 Shift 3 Official Paper

Answer 1

Concept used:

Co - prime numbers : Those numbers that have only one common factor

namely 1 i.e. they do not have any other common factor between them

other than 1 .

Calculation:

On considering option(1), we have

Two numbers is given 156 and 234

Common factors = 2, 3 ......etc

So, these are not co- prime as they have common factor between then rather than 1

On considering option (2), we have

Numbers are 161 and 192

Common factor = 1

So, these two are co- prime numbers

On considering option (3), we have

Numbers are 196 and 343

Common factors = 7

So, they are not co- prime as they have common factor between them rather than 1

On considering option (4), we have

Numbers are 228 and 247

Common factor = 19

So, they are also not co-prime numbers

Hence, the numbers 161 and 12 are co-prime numbers .