find the sum of all four digit no which when divided by25 leaves remainder 5
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you will get an A.P. starting with
1005,1030,1055.................,9980
first take out how many no. are there that can be calculated using the formula of last term
that is
a+(n-1)d therefore
9980=1005+(n-1)25
n= 360
as the formula for sum of A.P. is
n/2(2a + (n-1)d)
therefore sum will be1977300
1005,1030,1055.................,9980
first take out how many no. are there that can be calculated using the formula of last term
that is
a+(n-1)d therefore
9980=1005+(n-1)25
n= 360
as the formula for sum of A.P. is
n/2(2a + (n-1)d)
therefore sum will be1977300
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