LULUISn = n(n+1)24 (4+1)(a)The sum found frosquare grid (b)sS,=-2027+3 – InterviewSolution

1.

LULUISn = n(n+1)24 (4+1)(a)The sum found frosquare grid (b)sS,=-2027+3 = 10= 101930formula

Answer»

s19=19(19+1)/2=380/2=190 is the right answer

for n=19 ,Sn=190for n=30, Sn=465

S19= 19(19+1)/2 = 380/2=190

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