Question

Find the value of a25 - a15 for the AP: 6, 9, 12, 15

Answer 1

Answer:

30

Step-by-step explanation:

an = a+(n-1)d

a25 = 6+(25-1)3

a25=6+24*3

a25=6+72

a25=78

again

a15=6+(15-1)3

a15=6+14*3

a15=6+42

a15=48

according to question

a25-a15

78-48

30

Answer 2

$a25 - a15 = 30$