Asked by tanu sharma
Find the 4th term from the end of the AP -11, -8, -5, .........., 49.
Answers
Answered by
Arora
Common difference = d = a2 - a1 = -8 - (-11) = 3
If 49 is the nth term,
a(n) = a1 + (n-1)d
=> 49 = -11 + (n-1)3
=> 60 = 3n - 3
=> n = 21
So, 4th term from the end is the 18th term
a(18) = a1 + (18-1)d
= -11 + 17(3)
= -11 + 51
= 40
If 49 is the nth term,
a(n) = a1 + (n-1)d
=> 49 = -11 + (n-1)3
=> 60 = 3n - 3
=> n = 21
So, 4th term from the end is the 18th term
a(18) = a1 + (18-1)d
= -11 + 17(3)
= -11 + 51
= 40
Answered by
Steve
once you know d=3, just subtract it 3 times from 49:
49-3*3 = 40
49-3*3 = 40
Answered by
Siya samyal
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