using ismember with different arrays

a=[4 6 1 2]

a = 1×4

4 6 1 2

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b=[4 2 1 9]

b = 1×4

4 2 1 9

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c=[8 0 5 4]

c = 1×4

8 0 5 4

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[n,m]=ismember(a,b,c);   %How can i do it?

Error using ismember (line 118)
Invalid input. Valid flags are 'rows', 'legacy'.

Answer is 4... the 4 is in a,b and c

Answer 1

[Voss]

a=[4 6 1 2];
b=[4 2 1 9];
c=[8 0 5 4];

intersect(a,intersect(b,c))

ans = 4