Question

what number is exactly between 564.5 and 122.7 and what number is exactly between 122 and 544? pls send with solution​

Answer 1

Answer:

A={1,2,3,4,5,6,7,8,9,10}

Number of subsets of A containing two elements

=9+8+7+6+5+4+3+2+1

9(9+1)2=902=45

∴ Option (c ) is correct

Alternate Method

The number of subsets of A containing exactly two elements is:

.10C2=10×92×1=45

Step-by-step explanation:

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