Question

how many pieces Will there be if a ribbon is cut 20 times?​

Answer 1

Answer:

$21$  $Pieces$

Step-by-step explanation:

When we cut a ribbon $once$ there are $2$ $Pieces$

When we cut a ribbon $twice$ there are $3$ $Pieces$

∴When we cut a ribbon $20$ $times$ there are $21$ $Pieces$

Answer 2

Step-by-step explanation:

1. Cut the ribbon in half. Pieces got 2

2. Put the pieces on one another and cut again. Pieces now have 4

3. Put these 4 pieces one over other again and again cut it. Pieces now owned is 8.

4. Put all 8 pieces one over other again and cut it. Now the number of owned pieces is 16.

5. Now we need 4 more pieces so pick up any 4 ribbons from these 16 (no. Of ribbons left uncut 16-4 =12) and cut them. This cut will give you 8 ribbons and the 12 unpicked ribbons in total gives you 20 ribbons.