Answer:
B
Step-by-step explanation:
Answer:
Step-by-step explanation:
To solve this problem, we need to multiple and -2 by and add the results together:
Adding the two together give the following:
Answer: it's impossible to obtain 78
Step-by-step explanation: Since the calculator can double any number or permute its digits except 0
starting with number 1
1, 2, 4, 8, 16, 32, 64, 128
Therefore, it's impossible to obtain 78 by a series of these operations