In a book, page starts with digit 1. Total sum of page digits = 3269. What is the number of pages?
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sn = 3269
sn = n/2 + {a+( n-1)d}
a = 1
d =1
put all the value in formula and solve
sn = n/2 + {a+( n-1)d}
a = 1
d =1
put all the value in formula and solve
pragyadas:
an =n/2 {2a+(n-1) d} is the correct formula srry for typing mistake
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