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Grade: 11
        
If S  be the sum of the  first 2015 terms of the sequence 1,2,2,3,3,3,4,4,4,4,................. where n occurs as n terms . The sum of the digits of S is? Please answer this question..
4 years ago

Answers : (1)

Alfaz Khan
44 Points
							
11 is the answer,as
S=[A+L]n/2,
a=1,
l=2015
n=Tn
substitute
    
4 years ago
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