why for the minus before 99?
Given a series a1, a2, a3, ……. an. If a1 = 25 and every term in the series is ‘-2’ times its previous number, then which column is larger?
Col A: a100
Col B: -10,000
Is this a geometric progression? So, we would use the formula an=ar^(n-1)=25(-2)^-99. This is much less than -10,000. So B is larger.