Answer :
powerss of three are 3&+^x
lets try trial and error
3^1=3
3^2=9
3^3=27
3^4=81
3^5=243
3^6=729
3^7=2187
3^7 is more than 100 so the answer would be the powers up to 6
lets try trial and error
3^1=3
3^2=9
3^3=27
3^4=81
3^5=243
3^6=729
3^7=2187
3^7 is more than 100 so the answer would be the powers up to 6
