Question

Find the odd man out:
251,257,259,263,269,271,277
​

Answer 1

Given : 251,257,259,263,269,271,277

To Find :  odd man out:

Solution:

251  is prime number

257 is prime number

259  is not a prime number  259 = 7 * 37

263  is prime number

269  is prime number

271  is prime number

277  is prime number

Hence 259  is odd man out

as 259 is not a prime number but all other numbers are prime numbers

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