Question

1. 7th term of an AP is 10, sum of first 7
terms in it is 40 then sum of first 6
terms in that AP is
A) 33 B) 30 C) 43 D) 47​

Answer 1

Answer:

30 is the right answer I think huehuehuehuhuehuhiehuhuehuhehueheuehuheueheuehueheyehuehueheuehuehuehuehueh

Answer 2

Answer:

Correct option is

A

520

Let the first term be a and common difference is d,

a+(7−1)d=40

a+6d=40

Now sum of 13 term is

2

13

(2a+12d)=

2

13

.2.40=520