Question

from your pocket money you save Re.1 on day, Rs.2 on day 2, Rs.3 on day 3 and so on . how much money will you save in the monthe of march 2008

Answer 1

the total saving of money in the month of march 2008. = 496 Rs.

Answer 2

As it is given in question.. Saving is Rupee 1 On 1st day,2 rupees on 2nd day and 3 rupees on 3rd day and so on..

Clearly, it forms an A. P

1,2,3.....31. (as last day of march is 31 st)

So, a = 1 ,d =2-1

=1.

Last term (ań)=31

S31= n/2[2a+(n-1)d]

S31=31/2[2*1+(31-1)1

S31=31/2[2+30]

S31=31*16

S31=496

U save rupees 496 in march 2008

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