{"id":89484,"date":"2025-06-01T10:05:30","date_gmt":"2025-06-01T10:05:30","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=89484"},"modified":"2025-06-01T10:05:30","modified_gmt":"2025-06-01T10:05:30","slug":"which-of-the-following-is-the-odd-one","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-is-the-odd-one\/","title":{"rendered":"Which of the following is the odd one?"},"content":{"rendered":"

Which of the following is the odd one?<\/p>\n

[amp_mcq option1=”31″ option2=”41″ option3=”51″ option4=”61″ correct=”option3″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC CAPF – 2012<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\n51 is the odd one out.
\n<\/section>\n
\nLet’s examine the properties of the numbers:
\n– 31: Is a prime number (only divisible by 1 and 31).
\n– 41: Is a prime number (only divisible by 1 and 41).
\n– 51: Is a composite number (divisible by 1, 3, 17, and 51). 51 = 3 * 17.
\n– 61: Is a prime number (only divisible by 1 and 61).
\nThree of the numbers (31, 41, 61) are prime numbers, while 51 is a composite number.
\n<\/section>\n
\nPrime numbers are natural numbers greater than 1 that have no positive divisors other than 1 and themselves. A composite number is a positive integer that can be formed by multiplying two smaller positive integers. This property makes 51 distinct from the others in the list.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

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 Download PDFAttempt Online 51 is the odd one out. Let’s examine the properties of the numbers: – 31: Is a prime number (only divisible by 1 and 31). – 41: Is … <\/p>\n

Detailed SolutionWhich of the following is the odd one?<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1085],"tags":[1116,1102],"class_list":["post-89484","post","type-post","status-publish","format-standard","hentry","category-upsc-capf","tag-1116","tag-quantitative-aptitude-and-reasoning","no-featured-image-padding"],"yoast_head":"\nWhich of the following is the odd one?<\/title>\n<meta name=\"description\" content=\"51 is the odd one out. Let's examine the properties of the numbers: - 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.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-is-the-odd-one\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Which of the following is the odd one?\" \/>\n<meta property=\"og:description\" content=\"51 is the odd one out. Let's examine the properties of the numbers: - 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). 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