ആദ്യത്തെ അഞ്ച് ത്രികോണ സംഖ്യകളുടെ മാധ്യം എന്താണ്?

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RRB ALP Previous Paper 10 (Held On: 10 Aug 2018 Shift 1)
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  1. 7
  2. 5
  3. 8
  4. 6

Answer (Detailed Solution Below)

Option 1 : 7
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ത്രികോണ സംഖ്യ ഇനിപ്പറയുന്ന വ്യവസ്ഥകളെ തൃപ്തിപ്പെടുത്തും.

Xn = n(n + 1) /2

⇒ X1 = 1

⇒ X2 = 3

⇒ X3 = 6

⇒ X4 = 10

⇒ X5 = 15

N∴ ആദ്യത്തെ അഞ്ച് ത്രികോണ സംഖ്യകളുടെ മാധ്യം = (1 + 3 + 6 + 10 + 15) /5 = 7
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