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Hephz
@Hephz
September 2021
2
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find the sum of the series 103+101+99+....49
Answers & Comments
gaurav2013c
A = 103
d = - 2
L = 49
=> a +(n-1)d = 49
=> 103 + (n-1) (-2) = 49
=> (n-1)(-2) = - 54
=> n-1 = 27
=> n = 28
Sn = n / 2[ a + L]
S28 = 28/2 [ 103 + 49]
= 14 * 152
= 2128
11 votes
Thanks 17
gaurav2013c
Please mark as brainliest if the solution is helpful......
Hephz
yeah it was helpful
Hephz
marked it as brainliest
Hephz
you were too good
gaurav2013c
Thankew dear :)
Radhika5544
Hope it works to help you
3 votes
Thanks 3
Hephz
but i guess ur answer is wrong...
Hephz
please check it once...
Radhika5544
yeah!! i did
Radhika5544
it's wrong
Radhika5544
but i tried
Hephz
yeah
Radhika5544
hmm
Hephz
yeah and thanks for that...
Radhika5544
ur wlcm dear
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Answers & Comments
d = - 2
L = 49
=> a +(n-1)d = 49
=> 103 + (n-1) (-2) = 49
=> (n-1)(-2) = - 54
=> n-1 = 27
=> n = 28
Sn = n / 2[ a + L]
S28 = 28/2 [ 103 + 49]
= 14 * 152
= 2128