Question

Find S11 for 3 + 1 + (-1) + (-3) +…

Answer 1

so the 1st term A = 3, Common difference D = 1-3 = -2, n = 11

So 1st you have to find the 11th term.

Tn = A + (n-1)D

so find T11 1st .

Answer 2

11=3+(11-2)1-3

Answer 3

oh LOL.

T11 means 11th term.

T11 = 3 + (11-1).-2

a = 3, n = 11, d = -2.

Answer 4

Answers are


-77

-75

-73

-71

Answer 5

Im not getting none of these answers

Answer 6

Ok. T11 means 11th term which is

3 + (11-1)-2

=> 3 -20 = -17.

so a = 3, d = -2, and T11 = -17

If we have N Terms, then sum of N terms

=> N(a+Nth term)/2

Similarly u can find S11 = 11(3-17)/2, and see the ans.

Answer 7

-77=A :)