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For what value fo n are 2^(n)-1 and 2^(n...

For what value fo n are `2^(n)-1` and `2^(n)+1` prime?

A

7

B

5

C

2

D

1

Text Solution

Verified by Experts

The correct Answer is:
C
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S CHAND IIT JEE FOUNDATION-NUMBERS-QUESTION BANK -1
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  2. What is the units digit of the product of all prime numbers between 1 ...

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  3. For what value fo n are 2^(n)-1 and 2^(n)+1 prime?

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  4. In a six digit number, the sum of the digits in the even places is 9 a...

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  5. Which of the following numbers is divisible by 15?

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  6. The difference of a number consisting of two digits and the number ...

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  7. The number 89715938* is divisible by 4. The unknown non-zero digit ...

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  8. An integer is divisible by 16 if and only if its last X digits are ...

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  9. (4^(61)+4^(62)+4^(63)+4^(64)) is divisible by (a) 3 (b) 11 (c) 1...

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  10. If n is any natural number then n^(2)(n^(2)-1) is always divisible

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  11. The sum of all possible two digit numbers formed from three different ...

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  12. A 6-digit number is formed by repeating a 3-digit number: for examp...

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  13. The smallest number to be added to 1000, so that 45 divides the sum ex...

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  14. In the product 459 xx 46 xx 28* xx 484, the digit in the unit place is...

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  15. How many of the following numbers are divisible by 3 but not by 9? ...

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  16. When a number is divided by 893 , the remaineder is 193 . What will be...

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  17. What is the least natural number which leaves no remainder when div...

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  18. Positive integers

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  19. Consider the following statements: A. The product of an integer and ...

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  20. The rational number lying between 5/6 and 6/7 is

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