Question

11. If the sum of the first 14 terms of an AP is 1050 and its first term is 10, find the 20th term.

Standard:- 10

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Answer 1

Hey dear, here is your answer goes...

Accor. to question
n=14
S14=1050
a=10
a20=?

S14=n/2(2a+(n-1)d)
1050=7(20+13d)
1050=140+91d
1050-140=91d
910=91d
d=10

a20=a+(n-1)d
a20=10+19*10
a20=10+190
a20=200

hope it helps u dear.....