Numbers 7755

How many digits 7 are in numbers from 1 to 777?

Correct answer:

n =  234

Step-by-step explanation:

n1=1 n2=10+101=19 n3=(777700)+7 (n2+n1)3=(777700)+7 (19+1)3=214  n=n1+n2+n3=1+19+214=234



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