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19^(n) - 1 is...

`19^(n) - 1` is

A

always divisible by 9

B

always divisible by 20

C

in never divisible by 19

D

only (a) and (c) are true

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QUANTUM CAT-NUMBER SYSTEM-QUESTION BANK
  1. The expression 31^n+17^n is divisible by for every odd positive intege...

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  2. Which is not the factor of 4^(6n)-6^(4n) for any positive integer n?

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  3. 19^(n) - 1 is

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  4. Find the remainder when 38 + 71 + 85 is divided by 16.

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  5. Find the remainder when 1661 + 1551 + 1441 + 1331 + 1221 is divided ...

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  6. What is the remainder when 678 + 687 + 6879 + 6890 is divided by 17 ...

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  7. What is the remainder when (10 + 10^2 + 10^3 + 10^4 + 10^5) is divided...

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  8. Find the remainder when 123 xx 1234 is divided by 15.

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  9. Find the remainder when 1719 xx 1721 xx 1723 xx 1725 xx 1727 is divide...

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  10. Find the remainder when 7^7 is divided by 4.

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  11. Find the remainder when 11^8 is divided by 7.

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  12. Find the remainder when 5^(123) is divided by 7.

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  13. Find the remainder when 123^(321) is divided by 5.

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  14. Find the remainder when 923^(888) + 235^(222) is divided by 4.

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  15. Find the remainder of (3^(9415))/(80).

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  16. Find the remainder when 10^(1) + 10^2 + 10^3 + 10^4 + 10^5 + …….. + 10...

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  17. The remainder of (888^(222) + 222^(888))/(3) is :

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  18. The remainder of (888^(222) + 222^(888))/(5) is :

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  19. Find the remiander when 32^(32) is divided 7.

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  20. The remainder when 8^1785 is divided by 7 is:

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