Question: Let Jn be the n à n matrix each of whose entries is 1. Show that if n > 1, then (1- Jn)- =1-- 1_,

Let Jn be the n × n matrix each of whose entries is 1. Show that if n > 1, then
(1- Jn)- =1-- 1_, n-1

(1- Jn)- =1-- 1_, n-1

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