Question

PLZZZZZ SOLVE THIS QUESTION. ...​

Answer 1

Step-by-step explanation:

is ur answer.........

Answer 2

Given that:-

=> First term , a = 5

=>Last term ,l = an = 45

=>Sum of n terms ,Sn = 400

=>Number of terms , n =?

=>Common difference , d = ?

Solution :-

=> We know that sum of n terms,

=>Sn = n/2 (a+1)

=>400 = n/2(5+45) (By substituting)

=>400=n/2(50)

=>n =16.

Now,

=> l = a+(n-1)d

=>45 = 5 +(16-1)d

=>40 = 15d

=> d = 40/15

=>d = 8/3.