In order to make 50p using only 2p coins, you would need 25 of them. This is because each 2p coin is worth 2 pence, so 25 coins would equal 50 pence. This calculation is based on the fact that 100 pence make up £1, so half of that amount would be 50 pence.
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20p,50p,5p,2p
1p , 50p , 2p , 10p , 20p .5p
21 ways
1x 50p, 1x 10p, 1x5p, 2x2p
There are 201 ways.