SOLUTION: l = a + (n + 1) d; for n please help me solve. thank you!

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Question 163768: l = a + (n + 1) d; for n

please help me solve. thank you!
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
l=a+(n+1)d; for n
1=A+ND+D
ND=1-A-D
N=(1-A-D)/D