Advertisements
Advertisements
प्रश्न
For which of the numbers, from n = 2 to 8, is 2n − 1 a prime?
बेरीज
Advertisements
उत्तर
| n | 2n − 1 | Result | Prime/Not Prime |
| 2 | 2 × 2 − 1 = 4 − 1 | 3 | Prime |
| 3 | 2 × 3 − 1 = 6 − 1 | 5 | Prime |
| 4 | 2 × 4 − 1 = 8 − 1 | 7 | Prime |
| 5 | 2 × 5 − 1 = 10 − 1 | 9 | Not prime |
| 6 | 2 × 6 − 1 = 12 − 1 | 11 | Prime |
| 7 | 2 × 7 − 1 = 14 − 1 | 13 | Prime |
| 8 | 2 × 8 − 1 = 16 − 1 | 15 | Not prime |
For n = 2, 3, 4, 6 and 7 it is prime.
shaalaa.com
या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
APPEARS IN
संबंधित प्रश्न
Write all the prime numbers between:
10 and 40
List all even prime numbers.
State the following statement is True or False.
1 is the smallest prime number.
State the following statement is True or False.
If a number is prime, it must be odd.
Show that the following pairs are co-primes:
343, 432
Which of the following are co-primes?
Write 'T' for true and 'F' for false for the following statement.
The sum of two even numbers is always even.
Write all the composite numbers between 21 and 50.
2 is the only even prime number.
If a number can be arranged in many rectangular arrangements, it is:
