Questions
A man saves Rs. 200 in each of the first 3 months of his service. In each of the subsequent months his saving increases by Rs.40 more than the saving of immediately previous month. His total saving from the start of service will be Rs. 11040 after.
detailed solution
Correct option is A
Total saving = 200+200+200+240+280+… to n months = 11040 ⇒400+n−22[400+(n−3)40]=11040⇒(n−21)(n+26)=0⇒n=21Similar Questions
If the sum of first terms of an is , then the sum of squares of these terms is
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