the sum of first 9 terms of an arithmetic progression is 144 and it's 9th term is 28. then find the first term and common difference of the arithmetic progression
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Answer:
Ans is first term is 4 and common difference is 2. 666
Step-by-step explanation:
solve by applying Sn formula for getting First term then apply {An = a+(n-1) d } for getting common difference .
put everywhere n= 9