Can You Pass Harvard's Entrance Examination? | No Calculator Allowed

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[@sie_khoentjoeng4886]

Sn = a (p^n - 1) / (p - 1)
a = 4^1.5 (first term)
p = 4^1.5 (ratio, ie. 4^3 / 4^1.5)
n = 5 (number of ekement)
4^1.5 = (2^2) ^1 .5 = 2^3 = 8
So.
Sn = 8 x (8^5-1) /(8-1)
Sn = 8 x (32768-1) /7
Sn = 8 x 32767 / 7
Sn = 262136 / 7
Sn = 37448

[@rabotaakk-nw9nm]

7:10 60²+(4+5)60+4•5=
=3600+20•60+20 ??? 😳