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13,17,19,21,23 ഇവയിൽ കൂട്ടത്തിൽപെടാത്ത സംഖ്യ ഏത്?

A23

B21

C19

D13

Answer:

B. 21

Read Explanation:

21 is not a prime number


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ഒറ്റയാനേ കണ്ടെത്തുക
Based on the English alphabetical order, three of the following four letter-clusters are alike in a certain way and thus form a group. Which letter-cluster DOES NOT belong to that group? (Note: The odd one out is not based on the number of consonants/vowels or their position in the letter-cluster.)