1, Six ; 2, Sixes ; 3, Sixes ; ..... ; 100, Sixes!!

Level 1

N = 6 + 66 + 666 + ⋯ + 66666 ⋯ 66666 ⏟ Number of 6’s = 100 \large N = 6+66+666+\cdots + \underbrace{66666 \cdots 66666}_{\text{Number of 6's}=100}

How many times does the digit 7 7 appear in the number N N ?

90 34 99 33

Prem Chebrolu by Prem Chebrolu , 17, India

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