what is the successor of 999999 and the predecessor of it?

explain why XXXX , VX , IC , XVV are not used?

Write all the prime numbers btween 30 and 70

Make a list of seven consecutive numbers , none of which is prime

45+3{34-(18-14)} / 3[17+3*4-(2*7)]

what is the successor of 999999 and the predecessor of it?

explain why XXXX , VX , IC , XVV are not used?

Write all the prime numbers btween 30 and 70

Make a list of seven consecutive numbers , none of which is prime

Please give solution also.

45+3{34-(18-14)} / 3[17+3*4-(2*7)]