Question : Directions: Select the option that is related to the fifth number in the same way as the second number is related to the first number and the fourth number is related to the third number.
19 : 23 :: 11 : 13 :: 7 : ?
Option 1: 3
Option 2: 5
Option 3: 9
Option 4: 11
Correct Answer: 11
Solution :
Given:
19 : 23 :: 11 : 13 :: 7 : ?
This depicts the relation between the prime numbers.
19 : 23→19 is a prime number, after 19 the next prime number is 23.
11 : 13→11 is a prime number, after 11 the next prime number is 13.
Similarly, 7 : ?→7 is a prime number, after 7 the next prime number is 11.
So, the required number is 11. Hence, the fourth option is correct.
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