Which of the following is closest to 10^140 – 10^30 ? Answers.
A) 10^210
B) 10^140
C) 10^150
D) 10^90
E) 10^6
10^140 – 10^30   10^30 * (10^110 – 1)   as we know 10^2 - 1 means 100-1 and we get 99, which is approximately 100. hence (10^110 – 1) would remain as 10^110.   and 10^30 * 10^110 = 10^140. Answer is 10^140.
<result>B</result>
Which of the following is closest to 10^140 – 10^30 ?