Tag: geometric-series
Interview Questions
- Divide by 1.04 without dividing
- Divide by 0.98 without dividing
- Un-gross a 5% markup in your head
- Gross up $7.00 net of a 4% rebate
- Divide by 0.97 without dividing
- Sum 5 + 10 + 20 + … + 640 fast
- Sum the infinite series 9 + 3 + 1 + …
- Sum a tripling series 2 + 6 + 18 + … + 486
- Sum 3 + 6 + 12 + … + 384 at a glance
- The decimal expansion of 1/19
- The decimal expansion of 1/51
- The decimal expansion of 1/998
- The decimal expansion of 1/49