715=n/2[2+(n-1)3]
Solve for n
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715=n/2 (2+(n-1)3)
715*2=n(2+3n-3)
1430=n(3n-1)
n=1430. or. n=1431/3
n=477
hope this helps you mate.
715*2=n(2+3n-3)
1430=n(3n-1)
n=1430. or. n=1431/3
n=477
hope this helps you mate.
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