find the sum of the first 19 terms of the AP whose and Nth term is given by Tn =7 - 4 n
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Answered by
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Answer:
Step-by-step explanation:
Tn=7-4n
T1=7-4=3
T19=7-4(19)=7-76=-69
S19=n/2(T1+T19}
=19/2(3-69)
=19/2(-66)
=19(-33)
=-627
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Answered by
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627 is the correct answer.
please mark me
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