Question

23 Safia says,

3, 13 and 23 are all prime numbers so
all numbers that end in 3 must be prime.
Explain why she is wrong.

Answer 1

Explanation:

We only need to find one exception to prove that she is wrong.

One such number is 33, which = 3 * 11 ( noit prime).

Answer 2

Wrong because there will be sometimes a number that will be dividend by three completely.

See :-

• 93

93/3 = 31

• 63

63/3 = 21

• 33

33/3 = 11

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