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| 1. |
Given d=5,s9=75 find a and an |
| Answer» d=5 S9=75So 75=9/2(2a+8*5)150=18a+36018a=150-36018a=-210a=-210/18=-11.67an=-11.67+(n-1)*5=-11.67+5n-5an=5n-16.67 | |