>>> p = 1.2e6/7e9 # Probability of dying in any one year
  >>> scipy.exp(log(1-p)*70) # Probability of NOT dying 70 years in a row
  0.98807069644395429
  >>> 1-_
  0.011929303556045712

There might be some roundoff error in the exponentiation. I am too lazy to check.