Which number does not belong in the group 13, 17, 19, 21, 23?

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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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കൂട്ടത്തിൽ പെടാത്തത് ഏത് ?