Posted by tom on Tuesday, December 25, 2012 at 12:07am.
tom, chris, charls, TIM, lorra, lindy:
please do not use different aliases.
A[]B = A^B-(A+B)
for 3[]4, substitute A=3, B=4, rewrite the equation as:
3[]4=3^4-(3+4)=81-7=74
You can do the same for 7[]9.
If you wish, you can post your answer for checking.
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