Question
Find the 7th digit from the right in 25!
Answer: Option B
:
B
First find the number of zeros in 25!=(255=5)+(2525=1)=6
Now, we need to find the last non-zero digit at the end of 25!
1! to10! ends with 8 (non-zero).
11! to 20! also ends with 8 (non-zero).
21! to 25! ends with 6 (non-zero).
Hence 25!=8×8×6=.....4
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:
B
First find the number of zeros in 25!=(255=5)+(2525=1)=6
Now, we need to find the last non-zero digit at the end of 25!
1! to10! ends with 8 (non-zero).
11! to 20! also ends with 8 (non-zero).
21! to 25! ends with 6 (non-zero).
Hence 25!=8×8×6=.....4
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