Which of the following is the odd one?
[amp_mcq option1=”31″ option2=”41″ option3=”51″ option4=”61″ correct=”option3″]
This question was previously asked in
UPSC CAPF – 2012
– 31: Is a prime number (only divisible by 1 and 31).
– 41: Is a prime number (only divisible by 1 and 41).
– 51: Is a composite number (divisible by 1, 3, 17, and 51). 51 = 3 * 17.
– 61: Is a prime number (only divisible by 1 and 61).
Three of the numbers (31, 41, 61) are prime numbers, while 51 is a composite number.