Difference between revisions of "2007 Cyprus MO/Lyceum/Problem 2"
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==Solution== | ==Solution== | ||
− | <math>f(x+1)-f(x)=4^{x+1}-4^x=4\cdot4^x-4^x=(4-1)\cdot4^x=3\cdot4^x\ | + | <math>f(x+1)-f(x)=4^{x+1}-4^x=4\cdot4^x-4^x=(4-1)\cdot4^x=3\cdot4^x\Longrightarrow\mathrm{ E}</math> |
==See also== | ==See also== |