b1+b3=17,
b2+b4=68
b1 + b1*q^2 = 17
b1q + b1*q^3 = q*(b1 + b1*q^2) = q*17 = 68
q = 4
b1 + b1*16 = 17
b1 = 1
S1 = b1 = 1
b1+b3=17,
b2+b4=68
b1 + b1*q^2 = 17
b1q + b1*q^3 = q*(b1 + b1*q^2) = q*17 = 68
q = 4
b1 + b1*16 = 17
b1 = 1
S1 = b1 = 1