Finding The Value of N When Nth Term and AP is Given
Finding The Value of N When Nth Term and AP is Given
Finding The Value of N when Nth Term and AP is Given: To find the value of N we will first find the common difference and will then use the formula for the general term.
Example : Which term of the AP : 21, 18, 15,.....is- 81? Also, is any term 0? Give reason for your answer.
Solution : Here, a= 21 and and we have to find n.
as
So the common difference = -3
As
we have
So,
Therefore, the 35th term of the given AP is -81
Next, we want to know if there is any n for which . If such an n is there, then
i.e.,
i.e.,
So, the eighth term is 0.
For an AP, the first term is 17, common difference is - 4 and the nth term is - 3. Which of the following numbers represents the value of n? | |||
| Right Option : C | |||
| View Explanation | |||
The number of terms in the series 11, 15, 19, __________ , 211 is | |||
| Right Option : C | |||
| View Explanation | |||
Which term of the AP : 3, 8,13,18,........is 78 ? | |||
| Right Option : B | |||
| View Explanation | |||
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