Question

Find the total number of prime numbers which are less than 70?
(A) 17
(B) 18
(C) 19
(D) 20​

Answer 1

Answer:

c) 19

Step-by-step explanation:

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Answer 2

(C) 19 is the correct answer.

Pre-requisite knowledge:

• "A prime number generally is a natural number greater than 1 that is not a product of two smaller natural numbers."

• A natural number which is greater than 1 and that is not prime is called a composite number.

• For example, 7 is prime because the only ways of writing it as a product, 1 × 7 or 7 × 1, involve 7 itself.

The prime numbers which are less than 70 are:

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67

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