2, 5, 6, 7, 8 എന്നീ അക്കങ്ങൾ ഉപയോഗിച്ച്, എത്ര നാലക്ക സംഖ്യകൾ ഉണ്ടാക്കാം? (ആവർത്തിച്ചുള്ള അക്കങ്ങൾ അനുവദനീയമല്ല)

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  1. 120
  2. 115
  3. 110
  4. 113

Answer (Detailed Solution Below)

Option 1 : 120
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നൽകിയിരിക്കുന്നത്:

2, 5, 6, 7, 8 എന്നീ 5 സംഖ്യകൾ നൽകിയിരിക്കുന്നു

ആവർത്തനമില്ലാത്ത നാലക്ക സംഖ്യ 

ഉപയോഗിച്ച സൂത്രവാക്യം:

ആവർത്തനമില്ലാത്ത സംഖ്യാ പരിവർത്തനം = \(\frac{n!}{(n \ - \ r)!}\)

ഇവിടെ n = ആകെ സാധ്യമായ സംഖ്യകൾ

r = ആവശ്യമായ സംഖ്യ

കണക്കുകൂട്ടൽ:

ഇവിടെ ആകെ സാധ്യമായ സംഖ്യ n = 5

ആവശ്യമായ സംഖ്യ r = 4

സൂത്രവാക്യം പ്രയോഗിക്കുമ്പോൾ 

\(\frac{5!}{(5\ - \ 4)!}\)

⇒ 5!

⇒ 5 × 4 × 3 × 2 × 1 = 120

∴ സാധ്യമായ 120 നാലക്ക സംഖ്യകൾ ഉണ്ടായിരിക്കും.

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