Math, asked by adityaadi280, 1 year ago

answer it fast step by step explanation. ...... please fast​

Attachments:

adityaadi280: no one
gopalreddybella: a=-11 d=7/9
adityaadi280: step by step

Answers

Answered by gopalreddybella
1

Answer:

a=115/19 d=12/19

Step-by-step explanation:

=a+(12-1)d=13

=a+11d=13

and,

a+(a+d)+(a+2d)+(a+3d)=24

4a+6d=24

2a+3d=12

form,

a+11d=13

a=13-11d

sub^in2a+3d=12

2(13-11d)+3d=12

26-22d+3d=12

26-12=22d-3d

12=19d

d=12/19

a=13-11*12/19

a=13-132/19

a=247-132/19

a=115/19

sn=n/2(2a+(n-1)d)


adityaadi280: hmm
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