How many terms of the A.P. 27, 24, 21, … should be taken so that their sum is zero?
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How many terms of the A.P. 27, 24, 21, … should be taken so that their sum is zero?
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Answer:
Here d = - 3, a = 27
Sn = 0
=> n/2 [2a + (n - 1) d ] = 0
=> 2 (27) + (n - 1) (-3) = 0
=> n - 1 = 18
=> n = 19
Therefore, 19 terms should be taken to get the sum zero.
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QuestioN :
How many terms of the A.P. 27, 24, 21, … should be taken so that their sum is zero?
SolutioN :
"Solution is given in the attachment."