When three coins are tossed simultaneously, the total possible outcomes are: 

• When a single coin is tossed, there are equal chances of getting a head or tail (H, T), which means there are 2 possible outcomes.
• Now if 3 coins are tossed simultaneously then the possible outcomes will be:
  (HHH, HTH, HHT, TTH, THT, HTT, THH, TTT) 
  Where H denotes head and T denotes tail.

Therefore, there will be total of 8 possible outcomes if 3 coins are tossed simultaneously.