Sagot :
Answer:
Tinatanong din ng mga tao
How many strings of 4 decimal digits have exactly three digits that are 9s?
3. have exactly three 9s? There are 9 ways to pick the non-9 digit and 4 places to put it, so 9 · 4 = 36 in all.
Answer:
Tinatanong din ng mga tao
How many strings of 4 decimal digits have exactly three digits that are 9s?
3. have exactly three 9s? There are 9 ways to pick the non-9 digit and 4 places to put it, so 9 · 4 = 36 in all.