Question

if the sum of first 14 term of and AP is 1050 and firt term is 10 find the 20th term

Answer 1

a=10

S 14=1050

=14/2[20+13 d]=1050

=7[20+13 d]=1050

=20+13 d=150

d=10

20th term=a+19 d

=10+19×10

=10+190

=200

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Answer 2

The answer is a20 = -380