Easy
What is the decimal form of the sum 1/5 + 1/5 squared + 1/5 cubed + 1/5 to the power 4?
Explanation
Explanation
Calculating each term: 1/5=0.2, 1/25=0.04, 1/125=0.008, 1/625=0.0016. Summing gives 0.2+0.04+0.008+0.0016=0.2496.
PRO TIP
Re-check your working by substituting the answer back into the original question.