Question

find the sum of all four digit numbers, which when divided by 25 leaves 5 as a remainder​

Answer 1

Step-by-step explanation:

let sum=x

x/25=5

x=125

sum=125

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Answer 2

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

360/2(2+1005+(360-1)25

therefore sum will be 1977300 hope it will help you stay home stay safe