Which term of AP : 21, 18, 15,…. is zero ?
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8th......................term
Answered by
62
a = 21
d = 18 - 21 = -3 .
Let 0 be the n th term.
Now,
0 = 21 + ( n -1 ) -3
0 = 21 -3n + 3
0 = 24-3n
3n = 24
n = 24/3 = 8 .
Therefore, the 8th term is zero.
d = 18 - 21 = -3 .
Let 0 be the n th term.
Now,
0 = 21 + ( n -1 ) -3
0 = 21 -3n + 3
0 = 24-3n
3n = 24
n = 24/3 = 8 .
Therefore, the 8th term is zero.
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