MHB What are the last two digits of $2^{2n}(2^{2n+1}-1)$ in decimal notation?

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n is an odd positive integer number please find the last two digits of :

$2^{2n}(2^{2n+1}-1)$ (in decimal notation)
 
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Please... doe's the number written in binary or decimal notation?...

Kind regards

$\chi$ $\sigma$
 
decimal
 

Thread 'Trigonometry problem of interest'

Seemingly by some mathematical coincidence, a hexagon of sides 2,2,7,7, 11, and 11 can be inscribed in a circle of radius 7. The other day I saw a math problem on line, which they said came from a Polish Olympiad, where you compute the length x of the 3rd side which is the same as the radius, so that the sides of length 2,x, and 11 are inscribed on the arc of a semi-circle. The law of cosines applied twice gives the answer for x of exactly 7, but the arithmetic is so complex that the...
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