3 Which term of the AP: 21, 42, 63, 84, …………………. is 210?
Answers
Answered by
224
In the given A.P ;
a = 21
d = 42-21 = 21
l = 210
n = ?
l = a +(n-1)d
210 = 21+(n-1)21
n-1 = 189/21
n = 9+1
n = 10
hence 210 is the 10th term of given A.P
a = 21
d = 42-21 = 21
l = 210
n = ?
l = a +(n-1)d
210 = 21+(n-1)21
n-1 = 189/21
n = 9+1
n = 10
hence 210 is the 10th term of given A.P
Answered by
107
An = a+(n-1)d
210 = 21+(n-1)21
210-21 = (n-1)21
189/21 = n-1
9+1 = n
10 = n
210 = 21+(n-1)21
210-21 = (n-1)21
189/21 = n-1
9+1 = n
10 = n
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