bryantjorell
24.11.2020 •
Mathematics
Time of an AP is - 31 and 20 first term is - 71 find the first term
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Ответ:
it’s called being fu.cking smart
Let a be the 1st term of the AP and d be the common difference
According to the question
a+(10-1)d=31
a+9d=31 --->(i)
a+19d=71 --->(ii)
ii-i
10d=40
d=4
Putting value of d in i
a+9*4=31
a+36=31
a=-5
30th term of the AP=a+(30-1)d
=-5+29*4=116-5
=111
Step-by-step explanation:
Ответ: