Sets doubt

Gaurav Mohnani (OWNER) (536 Points)

27 June 2012

The number of proper sub sets of the set

{3, 4, 5, 6, 7} is

a) 32 b) 31 c) 30 d) 25

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3 Replies

Mihir Manohar (CA Final - Article Assistant) (474 Points)
Replied 27 June 2012

Its 31 refer the board book.

pratik singhal (z) (276 Points)
Replied 27 June 2012

mihmir pls can u work out if u can?

Mihir Manohar (CA Final - Article Assistant) (474 Points)
Replied 28 June 2012

Hi praitk the workout is in the following manner:

Let total no. of elements in a set be 'n'.

So as per the formula total no of substes are 2^n.

And to obtain proper subsets we have to deduct the set itself.

So total no. of proper subsets=2^n-1.

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