Question

if a=10 ,d=4 , then find a15=____​

Answer 1

Step-by-step explanation:

66 is the answer of your question

Answer 2

Answer: Given,

The common difference of an AP (d) = 4

Let the first term = a

To find,  = ?

We know that,

The nth term of an AP

= a + (n - 1)d

∴ The 15th term of an AP

= a + (15 - 1)d = a + 14d

The 10th term of an AP

= a + (10 - 1)d = a + 9d

∴  

= a + 14d - (a + 9d)

= a + 14d - a - 9d

= 5d

Put d = 4, we get

= 5(4)

= 20

∴  = 20

do in this process

Step-by-step explanation: