315 logs are stacked in a manner.25 logs in the bottom row,24 in the next row, 23 in the row next to it and so on. In how many rows the 315 logs are placed and how many logs are in the top row.
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a 25
d -1
an = 315
n =?
an = a+(n-1)d
315 = 25+ (n-1)-1
290 = (n-1)-1
290 = -n+1
-289 = n
d -1
an = 315
n =?
an = a+(n-1)d
315 = 25+ (n-1)-1
290 = (n-1)-1
290 = -n+1
-289 = n
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