Question

Question 9. Insert four numbers between 4 and 19 such that the resulting sequence is an AP.

Answer 1

Answer:

... 7, 10, 13, 16, ...

Step-by-step explanation:

Assume that the first term of AP is 4, then 19 will be the sixth term of AP.

4, $a_{2}$ , $a_{3}$ , $a_{4}$ , $a_{5}$ , 19 , ....

$a_{6}$ = 4 + (6 - 1)d = 19 ⇔ 5d = 15 ⇒ d = 3

4, 7, 10, 13, 16, 19