Question

if the sum of first 14 terms of AP IS 1050 and its first term is 10 find 20th term​

Answer 1

Answer:

Here is your ans....!!☺

Step-by-step explanation:

S14=1050 (given).

a=10(given)

Now,

S14=14/2[2(10)+(14-1)d]

1050=7(20+13d)

1050=140+91d

91d=910

d=10

Therefore,

a20=a+(n-1)d

=a+19d

=10+19(10)

=10+190

=200....

Hope it helpsss uhhhhhh!!!!!!

Answer 2

Step-by-step explanation:

s14=1050,

s14=14/2×(10+10(14-1)×d)

7×(20+13d)=1050

20+13d =1050/7=150

13d=150-20

d=130/13=10.

a20= a+( n-1) × d = 10+(20-1)×10 =10+(19)×10

= 10+190

= 200