what should replace the question mark and why?
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64
65
D
64. because every letter is replaced with the number of the position in the alphaeth, and then doubled. A=1 x2= B=2 x2= D=4 x2= H=8 x2= P=16 x2= 16 x2= 32 x2= 64
h a p p y b I r t h d a y
Well for one you cant buy Alex Rider the Gemini Project because it doesn't exist what your after is Alex Rider Point Blanc and as for that you can buy it in many places like amazon or got to the libary and get it :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :p :p :p :p :p :p :p :p :p :p :p :p :p :p :p :p :p :p :p :p :p :p :p :p :p :p :p :p :p :p :o :o :o :o :o :o :o :o :o :o :o :o :o :o :o :o :o :o :o :o :o :o :o :o :o :o :o :o :o :o :b :b :b :b :b :b :b :b :b :b :b :b :b :b :b :b :b :b :b :b :b :b :b :b :b :b :b :b :b :b :x :x :x :x :x :x :x :x :x :x :x :x :x :x :x :x :x :x :x :x :x :x :x :x :x :x :x :x :x :x :x :x :x :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :)
Nothing in English, there are no vowels.
B, D, E, F, H, I, K, L, M, N, P, R, T, (As capitals) b, d, h, i, k, l, m, n, p, q, r, (as small letters)
P. H. B. Lyon died in 1986.
P. H. B. Lyon was born in 1893.
d is to B as r is to P
It would be a square with side = sqrt (32)area = b x h = 32bh = 32b = 32/hb + h = minimumThis is a a max -min prob if you know calculusperimeter = p = b + h = 32/h + hfirst derivative = 0 is max or mindp/dh = 0 = -32/h^2 + 132 /h^2 = 1h^2 = 32h = sqrt 32b = 32/h = 32/sqrt 32 = 32(sqrt 32)/32 =sqrt (32)p = b + h = sqrt(32) + sqrt(32) = 2 sqrt(32) = 11.314 feet, minimum perimeter, a square with side sqrt(32) = 5.657 feet on a sideThe least perimeter is a square of side sqrt 32 which is the same as sqrt (2 x 16) which is the same as 4 root 2 so the perimeter would be 4 times that, ie (16 root 2) which is just over 22 feet 7½ inches.