Find the 20th term of the sequence: 7, 3, -1.............
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Answered by
4
We can see that the common difference is -4,
Now, these are in AP,
=> nth term = a + (n-1)d, where a is first term and d is common difference
So, 20th term = 7 + ( 20-1)(-4) = 7 - 76 = -69
Now, these are in AP,
=> nth term = a + (n-1)d, where a is first term and d is common difference
So, 20th term = 7 + ( 20-1)(-4) = 7 - 76 = -69
Answered by
1
a20 = a + 19d
a = 7
d = 3-7
d = -4
a20 = 7 + 19(-4)
a20 = 7 -76
a20 = -69
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