Question

find the sum of all natural no. divisible by 5 , but less than 100.
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Answer 1

⏩Hey mate❤

Find here

sum of all natural number divisible by 5 , but less than 100

so,

let

sn = 5+10+15+20+.......+95

here ,

a= 5, d= 5, n= 19

so,

sum of all series

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

sn= 19/2[ 2×5+(19-1)5]

sn= 19/2[(10+(18×5)]

sn= 19/2[ 10+90]

sn= 19×100 /2

sn= 19×50

sn= 950

_____________,_,________ wel

Thus:--

Sum will be

sn = 950

____________________,,,,_____

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