The sum of 5 digit number in which only odd digits occur without repet

1.	The sum of 5 digit number in which only odd digits occur without repetition is(a) 277775(b) 555550(c) 1111100 (d) 6666600
Answer» Correct option (d) 6666600 Explanation: Sum of n digit numbers = (Sum of digits) (10ⁿ - 1)/(10 - 1)(n -n - 1)! = (1 + 3 + 5 + 7 + 9)(10⁵ - 1)/10 - 1(5 - 1)! = 25 × 11111 x 24 = 6666600

The sum of 5 digit number in which only odd digits occur without repetition is(a) 277775(b) 555550(c) 1111100 (d) 6666600

Answer»

Correct option (d) 6666600

Explanation:

Sum of n digit numbers

= (Sum of digits) (10ⁿ - 1)/(10 - 1)(n -n - 1)!

= (1 + 3 + 5 + 7 + 9)(10⁵ - 1)/10 - 1(5 - 1)!

= 25 × 11111 x 24

= 6666600