Question

19. If 65 diagonals are drawn to a polygon of 'n' sides, then
what is the value of 'n'?
(1) 10 (2) 20 (3) 13(4) none
20. Find the 10% term in A.P. 5, 1, -3, -7......
(1) -31
(2) 31
(3) 41
21. If a, b, c are in A.P., then b-a=
atc
(1)
(2) c-b
(3) b2-1
(4) a - b
22. If a, b, c are in G.P., then
$\frac{?a}{?b}$
(1)
$\frac{b}{a}$
(2)
$\frac{a}{c}$
(3)
$\frac{c}{b}$

(4)
$\frac{c}{a}$
​

Answer 1

Step-by-step explanation:

19. none

20. -31

21. c-b

22. cant understand