Question

If the sum of first 14 terms of an AP is 1050 and its first term is 10.Find 20th term?

Answer 1

Step-by-step explanation:

S(n)=n/2(a1+a(n))

1050=14/2(10+an)

1050=7(10+an)

1050/7=10+an

150=10+a(n)

150-10=a(n)=a(20)=140