താഴെ കൊടുത്തിരിക്കുന്ന ശ്രേണിയിലെ ചോദ്യചിഹ്നത്തിന് (?) പകരം വയ്ക്കാൻ കഴിയുന്ന സംഖ്യ നൽകിയിരിക്കുന്ന ഓപ്ഷനുകളിൽ നിന്ന് തിരഞ്ഞെടുക്കുക.

69, 55, 26, 13, ?

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RRB NTPC CBT-I Official Paper (Held On: 28 Dec 2020 Shift 1)
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  1. 2
  2. 5
  3. 3
  4. 4

Answer (Detailed Solution Below)

Option 4 : 4
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RRB NTPC CBT-I Official Paper (Held On: 4 Jan 2021 Shift 1)
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തന്നിരിക്കുന്ന ശ്രേണി: 69, 55, 26, 13, ?

ഇവിടെ യുക്തി ഇപ്രകാരമാണ്:

മുമ്പത്തെ സംഖ്യാ അക്കങ്ങൾ പരസ്പരം ഗുണിച്ചാൽ + 1 = അടുത്ത സംഖ്യ.

ഇവിടെ പിന്തുടരുന്ന ക്രമം ഇതാണ്:

6 × 9 + 1 = 55

5 × 5 + 1 = 26

2 × 6 + 1 = 13

1 × 3 + 1 = 4

അതിനാൽ, ശ്രേണിയിലെ അടുത്ത സംഖ്യ "4" ആയിരിക്കും.

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