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When two values given a,b then

Number of numbers between a,b (including extreme values) = a-b+1

Number of numbers between a,b (excluding extreme values) = a-b-1

From question,

1,2,3…….7position………23positon……..Last position[L]

We can write as

(23-7)-1=(L-23)-1 [ becoz the person exactly between me(L) and my friend(7position) is on the 23rd position ]

15=L-24

L=39(Answer)

Number of numbers between a,b (including extreme values) = a-b+1

Number of numbers between a,b (excluding extreme values) = a-b-1

From question,

1,2,3…….7position………23positon……..Last position[L]

We can write as

(23-7)-1=(L-23)-1 [ becoz the person exactly between me(L) and my friend(7position) is on the 23rd position ]

15=L-24

L=39(Answer)