a) Find the common difference of the arithmetic sequence 1,9,17,...
b) Find its 11th term
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Answer:
this question common difference is 8
by applying this formula , we have to find the 11 term
tn=a+(n-1) d
Here, n = 11
d = 9 - 1 = 8
a = 1 (first term)
t 15 = 1 + ( 11 -1 ) 8
= 1 + (10 × 8)
= 1 + 80
= 81
therefore 81 is the 15th term
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