which term of ap 21,18,15.....-81 also find which term is zero
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Heya !!
AP = 21 , 18 , 15...........
Here,
First term ( A ) = 21
Common difference ( D ) = 18-21 = -3
Tn = -81
A + ( N - 1 ) × D = -81
21 + ( N - 1 ) × -3 = -81
21 - 3N + 3 = -81
-3N = -81 - 24
-3N = -105
N = 105/3 = 35
Hence,
35 term of the given AP will be equal to -81.
AP = 21 , 18 , 15...........
Here,
First term ( A ) = 21
Common difference ( D ) = 18-21 = -3
Tn = -81
A + ( N - 1 ) × D = -81
21 + ( N - 1 ) × -3 = -81
21 - 3N + 3 = -81
-3N = -81 - 24
-3N = -105
N = 105/3 = 35
Hence,
35 term of the given AP will be equal to -81.
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