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The expression 1! + 2! + 3! + 4! + ……….....

The expression `1! + 2! + 3! + 4! + ……….. + n!` (where `n ge 5)` is not a/an :

A

composite number

B

odd number

C

perfect square

D

multiple of 3

Text Solution

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The correct Answer is:
C
1! + 2! + 3! + 4! + 5! = 1 + 2 + 6 + 24 + 120 = 153
Since, the options (a), (b) and (d) are ruled out so the remaining
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QUANTUM CAT-NUMBER SYSTEM-QUESTION BANK
  1. If n! = ((n + 4)!)/((n + 1)!) , then the value of n is :

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  2. The value of (1.2.3…..9).(11.12.13…19).(21.22.23….29).(31.32.33……39)...

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  3. The expression 1! + 2! + 3! + 4! + ……….. + n! (where n ge 5) is not a/...

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  4. The HCF and LCM of 13! and 31! are respectively :

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  5. Find the number of zeros in the product of 10!.

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  6. Find the number of zeros at the end of the product of 2^222xx5^555

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  7. Find the number of zeros st the end of the product of the expression ...

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  8. Find the number of Zeros at the end of the expression - 10 + 100 + ...

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  9. Find the no. of zeros in expression 10 xx 100xx1000xx10000xx...1000000...

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  10. Number of zeros at the end of the following expression (5!)^(5!) + (10...

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  11. Find the largest power of 5 contained in 124! .

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  12. Find the largest power of 2 that can divide 268!.

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  13. Find the largest power of 7 that can exactly divide 777!.

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  14. Find the largest value of n in the 10^(n) which can exactly divide 100...

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  15. Find the number of zeros at the end of 1000!.

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  16. The number of zeros at the end of 100!, is

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  17. Find the highest power of 63 which can exactly divide 6336!.

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  18. Find the highest power of 40 which can exactly divide 4000!.

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  19. Find the highest power of 81 that can divide 1800!.

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  20. Find the unit digit of 123 + 345 + 780 + 65 + 44.

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