find the sum of first 80 natural numbers
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14
Hi !
An AP is formed ,
1,2,3,4,5 ....
a = 1 , d = 1 , n = 80
Sn = n/2 [ 2a + [ n-1]d]
S₈₀ = 80/2 [ 2 + 79 ]
= 40 × 81
= 3240
∴ Sum of first 80 natural numbers = 3240
An AP is formed ,
1,2,3,4,5 ....
a = 1 , d = 1 , n = 80
Sn = n/2 [ 2a + [ n-1]d]
S₈₀ = 80/2 [ 2 + 79 ]
= 40 × 81
= 3240
∴ Sum of first 80 natural numbers = 3240
Answered by
0
Answer: 3240
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