the first term of an athematic sequences with 1 and sum of first 4terms is 100 find the - Maths - Arithemetic Sequences

Question

the first term of an athematic sequences with 1 and sum of first
4terms is 100 find the 1st seven terms

Rishabh Mittal · Accepted Answer

Dear Student ,

Please find below the solution to the asked query :

We know ,Sn=n2 2a+n-1dHere sn=100 , n=4 , a=1100=42 2+4-1d100=22+3d50=2+3d3d=48d=16First 7 terms are a , a+d , a+2d , a+3d , a+4d , a+5d , a+6d1 , 17 , 33 , 49 , 65 , 81 , 97 
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the first term of an athematic sequences with 1. and sum of first 4terms is 100. find the 1st seven terms.