Show that each of the following sisa composite number .
(i)` 5xx 11xx 13 +13` (ii) ` 6xx 5xx 4xx 3xx2xx1+5`

Explanation

We have
(i) ` 5xx 11 xx 13 + 13 xx ( 5xx 11 +1) = ( 13xx 56)`
Clearly, it shows that the gvien number has more than two factors. Hence, it is a composite number.
(ii) ` 6xx 5xx4xx3xx2xx1 + 5 = 5 xx ( 6 xx 4 xx 3xx 2xx 1 +1)`
` = ( 5 xx 145)`
Clearly m it shows that the given number has more than two factors. Hence, it is a composite number.