Question

If the common difference of the AP is 5 then a 15 - a 11 is equal is

Answer 1

Answer:

Step-by-step explanation:

Hello ...

Best way to solve sum is ...

We know that Ap common difference is 5 ...we can use it ❣️❣️

The ap sequence looks like a,a+d,a+2d,a+3d,..............,a+nd

A 11 is equal to a+10d

Same as ,A 15 is equal to a+14d ...

Then a15 - a11 is equal to

a+14d - ( a +10d)

a+14d - a- 10d

A gets cancel ,,,,,14d - 10d

14× 5 - 10 ×5

70 - 50 = 20.

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Answer 2

Answer:

GIVEN:

common difference (d)=5

SOLUTION:

a15-a11

(a+(n-1)d) - (a+(n-1)d)

a+(15-1)5) - (a+(11-1)5)

a+14x5 -a-10x5

a+70-a-50

positive a and negative a get cancelled

70-50

=20