Question

The number of subsets {x, y, z} of S so that x, y, z are in A.P.

Answer 1

Answer:

Number of elements in A=10

Number of subsets of A containing exactly two elements

= Number of ways we can select 2 elements from 10 elements

10

C

2

=

2

10×9

=45

∴ Number of subsets of A containing exactly two elements =45

Answer 2

Answer:

right

Step-by-step explanation: