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Maths P4 HELP

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theigstudent:
2 (1 + 2 + 3 + ….. + n) =
2 ×n(n +1)
             2

= n (n + 1)

~M.J~:
thanxalot
by the way i was so stupid
i didn't look in the ms

theigstudent:
its  k   :D

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