JEE MATHEMATICS MCQ: PERMUTATIONS

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Application +4 | -1

The number of natural numbers which are less than

2 \cdot 10^8

and which can be written by means of the digit 1 and 2, is

View answer and explanation

Correct option: D

766

Option D (766) is correct because the sum of all possible numbers formed using digits 1 and 2, up to 8 digits, plus the 9-digit numbers starting with 1, equals 766.

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