bn = b1 * q^(n - 1)
b1*b2*b3 = b1*b1*q * b1*q^2 = (b1*q)^3 = 27
b1*q = 3
b1 * b2 * b3*b4*b5 * = b1*b1*q *b1*q^2 *b1*q^3 *b1*q^4 = b1^5*q^10 = (b1*q)^5 * q^5 = 3^5 * q^5 = 59049
q^5 = 59049/3^5 = 59049/243 = 243 = 3^5
q = 3
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Verified answer
bn = b1 * q^(n - 1)
b1*b2*b3 = b1*b1*q * b1*q^2 = (b1*q)^3 = 27
b1*q = 3
b1 * b2 * b3*b4*b5 * = b1*b1*q *b1*q^2 *b1*q^3 *b1*q^4 = b1^5*q^10 = (b1*q)^5 * q^5 = 3^5 * q^5 = 59049
q^5 = 59049/3^5 = 59049/243 = 243 = 3^5
q = 3