How many numbers can be formed with the digits 1, 2, 3, 4, 3, 2, 1 so that odd digits always occupy the odd places?

How many 7-digit numbers can be formed, using the digits 1, 2, 0, 2, 4,2 and 4?

How many 5-digit numbers can be formed by using the digits 5, 4, 3, 3,0?

How many 5-digit even numbers can be formed using the digits 1,2,5,4,5 ?

How many numbers can be formed from the digits 1, 2, 3, 9 if repetition of digits is not allowed ?

How many 3-digit even numbers can be formed from the digits 1, 2, 3, 4, 5, 6 if the digits can be repeated?

How many four-digit numbers can be formed by using the digits 1, 2, 3, 4, 5, 6, 7 if at least one digit is repeated.

How many three-digit numbers can be formed without using the digits 0, 2, 3, 4, 5 and 6?

How many 2-digit even numbers can be formed from the digits 1, 2,3, 4 and 5, if the digits can be repeated ?

How many 3-digit even numbers can be made using the digits 1, 2, 3, 4, 6, 7, if no digit is repeated?

How many words can be formed by using the letters of the word 'ORIENTAL so that A and E always occupy the odd places?