Question

Which of the following is the odd
one?
(a) 31
(b) 41
(c) 51
(d) 61; Which of the following is the odd; one?; (a) 31; (b) 41; (c) 51; (d) 61

Answer 1

51, is odd one out, because 3 other are prime and 51 is not. 51 is divisible by 1,3,17,51 more than a factor

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Answer 2

Ans

(c) 51

Step-by-step explanation

In this given question we got

in option (a) that is 31,

31 is a prime number,  a prime number has only two factors the first factor is 1, and the second one is itself. so 31 is a prime number because it has 1 and 31 as its factors

in option (b) that is 41, that is also a prime number which has 1 and 41 as its factors

in option (d) that is 61, that is also a prime number which has 1 and 41 as its factors

so , all three above options are the same and all are prime numbers.

in option (c)  that is 51, that is a composite number, a composite number is a number that has more than 2 factors.

factors of 51 are 1,3,17

so the correct answer is option (c) 51