Quantitative Aptitude :: Numbers - Discussion

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Explanation:
Here a= ? , d=7 , s=13524 , n=7
sum of A.P. = n/2(2a + (n-1)d)
so we have series a+(a+7)+(a+14).......=13524;
=> 13524=7/2(2*a+(7-1)7)
=> a=1911;