Question

sum of all
terms is 420
term
an A.P. the first
term is
is 4. The last term is 31
What is value of n?.​

Answer 1

Step-by-step explanation:

If the first term and last term in A.P. is 5 and 30 respectively and the sum is 420, then the value of n is 24.

Step-by-step explanation:

Let,

“a” = the first term of an A.P. = 5

“l” = the last term of an A.P. = 30

“Sn” = the sum of n terms of an A.P. = 420

We know that the formula of the sum of n terms in A.P. is given by,

Sn = \frac{n}{2}

2

n

[a + l]

Now, substituting the given values in the above formula, we get

420 = \frac{n}{2}

2

n

* [5+30]

⇒ 420 = (n/2) * 35

⇒ n/2 = 12

⇒ n = 12 * 2

⇒ n = 24

Thus, the value of n is 24.

Answer 2

Answer:

hii

Step-by-step explanation:

can you tell me what is the value of d( command difference)