Question

Find first three terms of sn=n2-n

Answer 1

sn =n2 -n
first term- s1 = 1 -1=0
second term- s2 = (2)2-2=4-2=2
third tERM- s3= (3)2-3=9-3=6
0,2,6 are the first three terms
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Answer 2

$s |n| = {n}^{2} - n \\ s |1| = sum \: of \: first \: term \: = \: first \: term \: itself \\ s |1| = 0 \\ s |2| = a |1| + a |2| = 2 {}^{2} - 2 \\ a |1| + a |2| = 2 \\ a |2| = 2 \\ s |3| = a |1| + a |2| + a |3| = 3 {}^{2} - 3 \\ a |3| = 6 - 2 - 0 = 4$
terms are
0,2,4,.....
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