How many times, 7 is appear to calculating 1 to 77! (factorial)?

Question

anonymous · Answer

in the expression or in the value?

raden · Answer

in the exact value...

anonymous · Answer

like zero times in following value?
77x7 = 539

raden · Answer

How u got idea, what is formula u used?

anonymous · Answer

I don't think i know it right now!

anonymous · Answer

but have i understood Question correctly?

anonymous · Answer

1-9 > 1
10-19 > 1
...
60-69 >1
=========
total 6

there are 9 sevens from 70 to 77
======================
total: 9 + 6 = 15

raden · Answer

but, its problem untill 77! 
77!=77*76*75*74*...*3*2*1, isn't right?
i think this is a big number

anonymous · Answer

u tell me How many times, 7 is appear to calculating 1 to 7!

then i will notice what u mean

anonymous · Answer

@RadEn 
are u there?

raden · Answer

yes..

raden · Answer

Do you have idea mukushla?

anonymous · Answer

i dont know what u mean by your question!

u solve an example for me:

How many times, 7 is appear to calculating 1 to 7!

anonymous · Answer

for example 7!=5040 so there is no 7 in this...do u mean like this?

raden · Answer

hmmm, maybe i should change my words, i just want to try translat indonesian language to english... how about u if the question is how much the number seven to calculating 1 to 77!
for example, if i want to find how much the number seven 1-100 (i got the answer 20)
and if i want to find how much the number seven 1-1000 (i got the answer 300)
So, how much the number seven 1-77! ?

anonymous · Answer

from1-1000 i think its 200

raden · Answer

from 1-100 i got 20
from 101-1000 i got 280
so, the total its 300

anonymous · Answer

oh sorry yes

raden · Answer

so, do u know what i means ?

anonymous · Answer

yeah i know

anonymous · Answer

RadEn its very late here...i gotta go i'll answer it tomorrow..

raden · Answer

OK, thanks ur coment... i wait ur answer :D

anonymous · Answer

:)