Question

27. If in an A.P., third term is 7 and seventh term is 2 more than three times the third term,
then find sum of its first 20 terms.
6
OR
6
1-cos
Prove that:
= cosec - cot
V1+cos e
OR
If median of the following distribution is 27, then find the values of x and y.
Class - interval 0-10 10-20 20 - 30 30 - 40 40 - 50 50 - 60 Total
Frequency 5
20 14
Y
8 68
6.
Sol.​

Answer 1

a)740

and sorry I did not understand ur second question if u can send it again I think I can help you .I cannot answer the 3rd one