Question

How many numbers between 0 and 1 million can be formed using 0, 7 and 8?
(A) 486
(B) 1086
(C) 728
(D) 900
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Answer 1

Answer:

good question

Explanation:

the answer is 728

option number (c)

Answer 2

Question ✔️

• How many numbers between 0 and 1 million can be formed using 0, 7 and 8?

(A) 486

(B) 1086

(C) 728

(D) 900

Answer ✔️

• We are given digits 0,7,8

• Now for a numbers to be greater than 0 any digit shall be non zero.

• While for it being less than a million it must not be a 6 digit number.

• So, for all digit we have 3 choices, 

No. of ways =3power6

• However, if all are filled with 000000 (zero) it doesn't satisfy our criteria

However, if all are filled with 000000 (zero) it doesn't satisfy our criteria∴ area 3power6−1

• 729 - 1 = 728

729 - 1 = 728