Question

2. A prime number, which when on reversing its digits gives another prime number is A) 31 B)311 C) 73 D) all​

Answer 1

Answer:

option d

Step-by-step explanation:

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Answer 2

Answer:

uestion 1.

How does the Sieve of Eratosthenes work ?

Solution:

The following example illustrates how the Sieve of Eratosthenes, can be used to find all the prime numbers that are less than 100. .

Step 1: Write the numbers from 1. to 100 in ten rows as shown below.

Step 2: Cross out 1 as 1 is neither a prime nor a composite number.

Step 3: Circle 2 and cross out all the multiples of 2. (2, 4, 6, 8, 10, 12, ………… )

Step 4: Circle 3 and cross out all the multiples of 3. (3, 6, 9, 12, 15, 18,………….)

Step 5: Circle 5 and cross out all the multiples of 5. (5, 10. 15, 20, 25……………… )

Step 6: Circle 7 and cross out all multiples of 7. (7, 14, 21. 28, 35, ………………….. )