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Question

Neela saves in a Mahila Bachat gat Rs. 2 on the first day of February, Rs. 4 on the second day, Rs. 6 on the third day and so on. What will be her saving in the month of February 2010?

A
786
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B
812
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C
892
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D
788
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Solution

The correct option is B 812
Since, 2010 is not a leap year.
Total no. of days in the month of February 2010=28
The savings done by Neela on each day is as follows 2,4,6,.......
This sequenceform an A.P. with first term a=2 ,common difference d=2 and number of terms n=28.
Since, Sn=n2[2a+(n1)d]
S28=282[2×2+(281)2]
S28=14[4+54]
S28=812
Total savings for the month of February (S28)=Rs.812

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