Question

Find the sum of all odd three digit numbers that are divisible by 5

Answer 1

75 is the correct answer re

Answer 2

Answer:

here first and important thing is question tell about odd three digit number which is

105,115,125---------------995

we can't take 100 beacuse its even three digit number

now come to question

a (first term) = 105

l (last term) = 995

d (common differencce ) = 10

n (no of term) = ?

apply simple AP formula which is l = [a + (n-1)d]

Step-by-step explanation:

put all above value in formula we get n = 90

since, we get no of term which is divisible by

odd three digit number b\w 1 05 and 995 is 95

now we find sum of these 95 term we simply apply sum of ap formula

n/2 [a+l]

90/2 [105+995]

49500 is the correct answer