how many three digit numbers are divisible by 3 find thier sum
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Answer:
Step-by-step explanation:
102,105,108,............................999.
From above AP,
we have,
a= 102
d= 3
an= 999
n=?
Sn= ?
By Formula ;- an= a+ (n-1) d
999= 102 + (n-1) 3
999-102= (n-1)3
897= (n-1)3
897/3 = n-1
299+1= n
n= 300
By Formula ;- Sn= n/2 (a+l)
Sn= 300/2 (102+999)
150*1101
Sn= 165,150
Hope it will help u:)
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