Question
Question: The sum of the factor of 8 ! which are odd and are of the form (3m + 2) where m Î N, is...
The sum of the factor of 8 ! which are odd and are of the form (3m + 2) where m Î N, is
A
40
B
8
C
45
D
35
Answer
40
Explanation
Solution
8! = 27. 32 . 5. 7 for odd factors of the form
3m + 2 we can take combination of 5 & 7. The required factors are 5 & 35
sum = 40