| You know how many zeros come after each 1 (n zeroes after the nth 1)
So after the 98th 1 is 98 zeros
Between 98th 1 and 101st 1 you have
98 zeros +
99 zeros +
100 zeros
don't count 101, because those zeros are after the 101st 1.
so it's 98+99+100 = 297 |