Math, asked by kaurdavinder9955, 3 months ago

In an A.P. Sn= -5 , A= 5/7 and D= -1/2 find n?

Answers

Answered by abhaykumargupta7903

0

Answer:

you use this formula

Step-by-step explanation:

Sn= a+ (n-1) d

Sn = n/2 [2a+(n-1)d]

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