Math, asked by navin750544, 11 months ago

1+3+5+7.....…...+99=​

Answers

Answered by Anonymous
18

Answer:

2500

Step-by-step explanation:

a = 1

d = 2

an or L = 99

using An formula

{a}_{n} =a + (n - 1)d \\  \\ 99 = 1 + (n - 1)2 \\  \\ 98 = (n - 1)2 \\  \\  \frac{98}{2}  = n - 1 \\  \\ n = 50

Using Sn formula

{s}_{n} = \frac{n}{2} (a + l) \\  \\ {s}_{n} = \frac{50}{2} (1 + 99) \\  \\ {s}_{n} =25(100) \\  \\ {s}_{n} =2500

Answered by sumipree26
1

Answer:

1,457

Step-by-step explanation:

1+3+5+7+ 9, 15, 21, 25, 27, 33, 35, 39, 45, 49, 51, 55, 57, 63, 65, 69, 75, 77, 81, 85, 87, 91, 93, 95, +99 = 1,457

hope it helps u

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