Please explain step by step and gimme the correct answer I need it pls, I will mark brainliest
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Step-by-step explanation:
Hlo guys how are
Hope you all are good enjoying your life I am new on brainly I am glad to have such friends like u
#Support me #f.o.l..l.w me and get more points and enjoy your self
apply this n(n+1)( 2n+1)/2
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