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18 Nov 2023, 07:10
Kudos
Bookmarks
C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
85% (01:09) correct
15%
(01:48)
wrong
based on 84
sessions
History
Date
Time
Result
Not Attempted Yet
What is the value of \(\frac{1}{7!} - \frac{1}{8!}\) ?
A. 1/6!
B. 1/7!
C. 7/8!
D. 8/7!
E. 7/6!
A. 1/6!
B. 1/7!
C. 7/8!
D. 8/7!
E. 7/6!
18 Nov 2023, 08:56
Kudos
Bookmarks
Put everything on the same denominator:
1/7! - 1/8! = (8! - 7!)/(8!*7!)
Factor out 7! in the numerator, and cancel it out with the denominator...
7!(8-1)/(7!*8!) = 7/8!
Answer C imo
1/7! - 1/8! = (8! - 7!)/(8!*7!)
Factor out 7! in the numerator, and cancel it out with the denominator...
7!(8-1)/(7!*8!) = 7/8!
Answer C imo
