If `n_1` and `n_2` are five-digit numbers, find the total number of ways of forming `n_1` and `n_2` so that these numbers can be added without carrying at any stage.

If n_1a n dn_2 are five-digit numbers, find the total number of ways of forming n_1a n dn_2 so that these numbers can be added without carrying at any stage.

n_(1) and n_(2) are four-digit numbers,find the total number of ways of forming n_(1) and n_(2) so that n_(2) can be subtracted from n_(1) without borrowing at any stage.

n_1a n dn_2 are four-digit numbers, find the total number of ways of forming n_1a n dn_2 so that n_2 can be subtracted from n_1 without borrowing at any stage.

Find the total number of n -digit number (n>1) having property that no two consecutive digits are same.

Find the total number of n -digit number (n >1) having property that no two consecutive digits are same.

Find the total number of n -digit number (n >1) having property that no two consecutive digits are same.

Find the total number of n -digit number (n >1) having property that no two consecutive digits are same.

Find the total number of n -digit number (n >1) having property that no two consecutive digits are same.