Q. Evaluate the summation below.5k=0∑3(1−3k2)Answer:
Write Terms Explicitly: Write out the terms of the series explicitly.The series is 5 times the sum from k=0 to 3 of (1−3k2). This means we need to calculate the value of (1−3k2) for each k from 0 to 3 and then multiply the sum of these values by 5.
Calculate Terms: Calculate the terms of the series.For k=0: (1−3(0)2)=1For k=1: (1−3(1)2)=1−3(1)=1−3=−2For k=2: (1−3(2)2)=1−3(4)=1−12=−11For k=3: (1−3(3)2)=1−3(9)=1−27=−26
Sum Terms: Sum the terms of the series.The sum of the terms 1−3k2 from k=0 to 3 is 1+(−2)+(−11)+(−26).This sum is 1−2−11−26=−38.
Multiply by 5: Multiply the sum by 5. The final step is to multiply the sum of the series by 5. 5×(−38)=−190.
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