the 17th term of an AP is 5 more than twice its 8th term. If 11th term of AP is 43, find its nth term
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whose n th term man explain your questions
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Step-by-step explanation:
17th terms =a+16d
8th term=a+7d
11th term=a+10d=43
find an
a17=5+2(a8)
a+16d=5+2(a+7d)
a+16d=5+2a+14d
2d-a=5-----1
and we know a+10d=43-----2
add 1 and 2
12d=48
D=4
a+10d=43
a+10(4)=43
a=43-50=3
nth term =a+(n-1)d=3+(n-1)4=3+4n-4=4n-1
n th term is 4n-1
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