Question

Q6 : In an A.P let a = -7 & d = 5, then 18th term is



70

74

82

78

​

Answer 1

Answer:

78.................

Answer 2

Answer:

The 18th term of AP is 78.

Step-by-step-explanation:

NOTE: Kindly refer to the attachment.

Additional Information:

1. Arithmetic Progression:

1. In a sequence, if the common difference between two consecutive terms is constant, then the sequence is called as Arithmetic Progression ( AP ).

2. $\sf\:n^{th}$ term of an AP:

The number of a term in the given AP is called as $\sf\:n^{th}$ term of an AP.

3. Formula for $\sf\:n^{th}$ term of an AP:

$\sf\:t_{n}\:=\:a\:+\:(\:n\:-\:1\:)\:d$

4. The sum of the first n terms of an AP:

The addition of either all the terms of a particular terms is called as sum of first n terms of AP.

5. Formula for sum of the first n terms of A. P. :

$\boxed{\sf\:S_{n}=\frac{n}{2} [ 2a + ( n - 1) d ]}$