Hey there!
The mistake occurs in
step.
Step-by-step explanation:
As in
step we can easily notice that 8 + 2 gives 10,but here it's written 4. For which the answer came invalid.
So the answer will be:
Step 1: 8 + 2 + (3 × 1)
Step 2: 8 + 2 + 3
Step 3: 10 + 3 [ corrected]
Step 4: 13
Hope it helps