Hello friends plz answer my question as early as possible
question no.3
Attachments:
Answers
Answered by
1
a=20
d=77/4 - 20
=77/4 - 80/4
= -3/4
Now,
an<0
=> a+(n-1)d<0
=>20-3n/4+3/4<0
=>83/4=3n/4
=>83= 3n
=>n=83/3
Therefore n =27 2/3
Hence 28th term is the first negative term.
d=77/4 - 20
=77/4 - 80/4
= -3/4
Now,
an<0
=> a+(n-1)d<0
=>20-3n/4+3/4<0
=>83/4=3n/4
=>83= 3n
=>n=83/3
Therefore n =27 2/3
Hence 28th term is the first negative term.
Similar questions