Ramya saves two coins of Rs 2 on first day of the week, 4 coins on the second day of the week, 6 coins on the third day of the week and so on. How much money will she save at the end of the week?
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Answer:
Rs 24.5
Explanation:
its an arithemetic progresseion where
a=rs2 d=rs4-rs2=rs2 and n=7 as there are 7 days in a week
hence as Sn= n/2(2a+(n-1)d)
=7/2(4+(7-1)2)
=7/2(7)=49/2=24.5
hence by the end of the week he collects a sum total of rs 24.5
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