Q. Find the value of the following expression and round to the nearest integer:n=0∑98300(0.96)n−1Answer:
Find First Term: We are given a geometric series with the first term a=300(0.96)−1 and the common ratio r=0.96. The sum of a finite geometric series can be found using the formula Sn=a(1−rn)/(1−r), where n is the number of terms. First, we need to find the first term a.a=300(0.96)−1=300/0.96=312.5
Calculate Number of Terms: Next, we calculate the number of terms in the series. Since the series starts from n=0 and goes to n=98, there are 99 terms in total.
Use Sum Formula: Now we can use the sum formula for a geometric series to find the sum S99. S99=(1−r)a(1−rn)=(1−0.96)312.5(1−0.9699)
Calculate Numerator: We calculate the numerator of the fraction, which is 1−0.9699. 1−0.9699≈1−a very small number Since 0.9699 is a very small number, we can approximate this to 1 for the purpose of simplification.
Calculate Denominator: Now we calculate the denominator of the fraction, which is 1−0.96. 1−0.96=0.04
Find Sum: We can now find the sum S99 by dividing the numerator by the denominator.S99≈0.04312.5=312.5×25=7812.5
Round to Nearest Integer: Finally, we round the sum to the nearest integer. 7812.5 rounded to the nearest integer is 7813.
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