Find the sum of first 25natural numbers divided by 7
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s25=2275
Step-by-step explanation:
The A.P of first 25 natural numbers divisible by 7,
7,14,21,28,........175
Here,
First term (a) = 7
Common difference (d) =7
last term(l) = 175
Sn =n÷2 (a+l] -----{Formula}----
S25
=25÷2 [7+175]
= 25÷2[7+175]
= 25÷2×182
=25×91
= 2275
The sum of first 25 natural numbers divisible by 7 is 2275
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