quick question on an FP2 sum

Don't worry about part (a) I get that, but could someone explain why you have to half the sum in part (b)?

I got

\frac{20}{861}

but in the mark scheme they half all of it :mad:

Original post by hello calum

Don't worry about part (a) I get that, but could someone explain why you have to half the sum in part (b)?

I got

\frac{20}{861}

but in the mark scheme they half all of it :mad:

The mark scheme is wrong - you can see they've introduced an extra factor of 1/2.

It's a mistake, you are correct.

The mark scheme is wrong - you can see they've introduced an extra factor of 1/2.

It's a mistake, you are correct.

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