Question

find sum of all natural number that are less than 100 and divisible by 4

Answer 1

4,8,12,16,20,24,28,32,36,40,44,48,52,56,60,64,68,72,76,80,84,88,92,96
sum=1200

Answer 2

hey your answer is here

The smallest natural numbr divisible by 4=4
the largest number inside 100 =96
thus a=4
d=8-4=4
n=?
an=96
an=a+(n-1)d
96=4+(n-1)4
96-4=4n-4
92+4=4n
96=4n
n=96/4
n=24

sn=n/2(a+l)
 
so when we do it,we get
sn=24/2(4+96)
sn=1200
hope it help u!!!!!
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