Question

Number of ten-digit numbers be formed by using the digits 3 and 7 only are $2^{10}$

• A. True
• B. False

Answer 1

The correct option is A True

A ten digit number will have 10 places for either 3 or 7

So, each place can be filled with anyone of these numbers

Hence, Total numbers formed according to question

$=2\ast 2\ast 2\ast 2\ast 2\ast 2\ast 2\ast 2\ast 2\ast 2=2^{10}$