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Show that 2+7+12……….+(5n-3)= (n(5n-1))/2...

Show that 2+7+12……….+(5n-3)= `(n(5n-1))/2`

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2 + 7 + 12 + . . . + (5 n - 3) = (n(5 n -1))/(2)

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