Question
In the following question, select the odd number pair
from the given alternatives. (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g., 25 - Operations on 25 such as adding/ subtracting/ multiplying etc. to 25 can be performed. Breaking down 25 into 2 and 5, and then performing mathematical operations on 2 and 5 is not allowed)Solution
The logic followed here is as follows: All the number pairs, except '31, 33', consist of consecutive prime numbers. 3 and 5 are consecutive primes. 7 and 11 are consecutive primes. 23 and 29 are consecutive primes. 31 is a prime number, but 33 is a composite number (divisible by 3 and 11). So, '31, 33' is the odd number pair.
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