a question from iit on permutations nd combinations

JEE Main 2015 Tutorials › Fundamentals questions › a question from iit on permutations nd combinations

The number of seven digit integers, with sum of the digits equal to 10 and formed by using the digits,1,2 and 3 only,is:

a)55
b)66
c)77
d)88

I got b)66 as the answer but tata mcgraw hill says that c)77 is the answer.who is right nd who is wrong?Please support yur answer with proper steps.....

#Mathematics #Fundamentals

UP 0 DOWN 0 0 2
Post on FacebookPost anonymously?

2 Answers

Euclid ·2010-09-15 17:45:09

TMH is right....its 77..........

the numbers can be arranged only in two ways...

1,1,1,1,1,2,3 and 1,1,1,1,2,2,2

UP 0 DOWN 0
Post on FacebookPost anonymously?

chessenthus ·2010-09-15 22:03:37

thank you. I thought that 1,1,1,1,1,2,3 were only to be used.

UP 0 DOWN 0
Post on FacebookPost anonymously?

Your Answer

Basic Integral Calculus Operators Symbols Matrix Cases

√ √ || {} [] () → ~ ^ x x x → → ln log lg lim lim cos sin tan cot arcsin arccos arctan

∫ ∫ ∫ ∫ ∫ ∬ ∬ ∬ ∬ ∬ ∭ ∭ ∭ ∭ ∭ ⨌ ⨌ ⨌ ⨌ ⨌

∑ ∑ ∑ ∑ ∑ ∮ ∮ ∮ ∮ ∮ ∏ ∏ ∏ ∏ ∏ ∐ ∐ ∐ ∐ ∐

+ - × ÷ ± ∓ = ∪ ∩ ≠ ∼ ≈ ∅ ∀ ∃ ∈ ∋ ∝ ≤ ≥ ≃ ≅ ≡ < > ≪ ≫ ⊂ ∉ ⊃ ⊆ ⊇ ⇒ ⇐ ⇔ ⇒ ⇐ ⇔ ⇑ ⇓ ⇕ → ← ↔ → ← ↔ ↑ ↓ ↕ ↖ ↗ ↘ ↙ ↪ ↩ ⇀ ↼ ⇁ ↽

° ∂ ∞ α β γ δ θ λ μ ν ξ π ρ σ φ ω ε ƒ κ τ υ Γ Δ Λ Σ Π Ω

Close [X]

a question from iit on permutations nd combinations

2 Answers

Your Answer

Add Image

Similar Questions