Question

If A = 7 , D = 3 , N = 8 find An and the general form

Answer 1

A = 7

D = 3

N = 8

∴ An = a + (n-1) d

A8 = 7 + (8 - 1) ×3

A8 = 7 + 7 ×3

A8 = 7 + 21

A8 = 28

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Answer 2

Given:

• A = 7
• D = 3
• N = 8

To Find:

• $A_n$ and the general form.

Solution:

We are using the formula of arithmetic progression which is given by,

$a_n$ = a+(n-1)d → {equation 1}

The above equation is the general form.

On substituting the values in equation 1 we get,

⇒ $a_8$ = 7+(8-1)3 {subtracting the terms}

⇒ $a_8$ = 7+(7)3 = 7 + 21 {multiplying the terms and adding them}

⇒ $a_8$ = 28

∴ $a_n$ = $a_8$ = 28