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Rasek [7]
3 years ago
8

Find the sum of all odd integers between 70 and 120​

Mathematics
1 answer:
Evgen [1.6K]3 years ago
3 0

Answer:

It forms an AP

AP : 71 , 73 , 75 , .................. 119

a = 71

d = 2

a_n= a + (n-1)d

119 = 71 + (n-1)2

n-1 = (119 - 71)/2

n = 24

S_n = n/2 × (a + a_n)

= 24/2 × (71 + 119)

= 12 × 190 = 2280

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