Question
How many 4-digit numbers can be formed using digits
1–9 if repetition is not allowed and the number is even?Solution
ATQ,
Units digit even → choices: 2,4,6,8 → 4 choices Remaining 3 digits from remaining 8 digits: permutations 8P3 = 336 Total = 4 × 336 = 1344
More Permutation and combination Questions
- What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)
√323.89 × (3.20) ÷ 9.02 =?
24.11% of 249.99 + √143.97 ÷ 12.02 = ?
5983.987 + 59832.999 – 598.873 = ?
(100.01% of 44.89) ÷ 14.98 = √? - √48.98
(5.013 – 30.04) = ? + 11.98% of 4799.98
(4096)1/3 × 10.11 × 11.97 ÷ 24.32 = ? + 15.022
- √81.45 + √225.60 + 49.89% of (520.43 + 22.13% of 131.45) = ?
40.024 of 54.89% of 19.9 = ? × √(2661.98/22.09)
Find the approximate value of Question mark(?) for given equation.
135.86% of 249.99 + 24.95 × 14.03 ÷ 2.01 = ?
