answer it fast step by step explanation. ...... please fast
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adityaadi280:
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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)
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