Question

If the common difference of an ap is 3,then find a20-a15

Answer 1

⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐

Given that,

Common difference, d = 3

Then find, 20 - a15 =?

We know that,

a15 = a + 14d

a20 = a + 19

So,

➡️

➡️ a20 - a15

➡️ a +19d - ( a + 14d )

➡️a + 19x 3 - ( a + 14 x 3 )

➡️a + 57 - a - 42

➡️ 15

⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐

So the answer is 15.

⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐

I hope it will help you a lot

Thanks

@drsm

Answer 2

a20 -a15 =a+19d -a+14d
a+19x3 -a+14×3
57-42
15