It appears that none of your option choices are correct,, are you sure you copied them right ? I will show you how to solve this and how I got my answer. The first step for solving this is to add the numbers in the parenthesis. 3 × 11 × 2 - 14 ÷ 7 Divide -14 by 7. 3 × 11 × 2 - 2 Divide the first 3 numbers together. 66 - 2 Subtract the numbers together to get your final answer. 64 Let me know if you have any further questions. :)
For a string length of 1 there are 2 possible strings (2^1) for a string length of 2 there are 4 possible strings (2^2) for a string length of 3 there are 8 possible strings (2^3) So, for string length of 7 there are 128 possible strings (2^7)
