(a + b + c) = 19 మరియు (a2 + b2 + c2) = 155 అయితే, (a - b)2 + (b - c)2 + (c - a)2 విలువను కనుగొనండి.

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SSC CGL 2023 Tier-I Official Paper (Held On: 18 Jul 2023 Shift 2)
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  1. 104
  2. 108
  3. 100
  4. 98

Answer (Detailed Solution Below)

Option 1 : 104
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Detailed Solution

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ఇచ్చిన:

(a + b + c) = 19

(a 2 + b 2 + c 2 ) = 155

ఉపయోగించిన ఫార్ములా:

a2 + b2 + c2 - (ab + bc + ca) = (1/2) × [(a - b)2 + (b - c)2 + (c - a)2]

లెక్కింపు:

a + b + c = 19

రెండు వైపులా వర్గీకరించడం

⇒ (a + b + c)2 = (19)2

⇒ a2 + b2 + c2 + 2 × (ab + bc + ca) = 361

⇒ 155 + 2 × (ab + bc + ca) = 361

⇒ 2 × (ab + bc + ca) = (361 - 155)

⇒ (ab + bc + ca) = 206/2 = 103

ఇప్పుడు,

a2 + b2 + c2 - (ab + bc + ca) = (1/2) × [(a - b)2 + (b - c)2 + (c - a)2]

⇒ 2 × (155 - 103) = (a - b)2 + (b - c)2 + (c - a)2

⇒ (a - b)2 + (b - c)2 + (c - a)2 = 104

∴ సరైన సమాధానం 104.

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