Question

please answer this ques. i know the ans is 1/7 but i don't know the step by step explaination​

Answer 1

Answer:

Step-by-step explanation:

[ 3 - 4(3 - 4)-1]-1

[3 -4(-1)-1]-1

[3 + 4 -1]-1

[7 -1]-1

= 7