GP मधील 4 पदांची बेरीज शोधा, पहिली संज्ञा 16 आहे आणि सामान्य गुणोत्तर 6 आहे.

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UP Police SI (दरोगा) Official PYP (Held On: 2nd Dec 2021 Shift 1)
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  1. 4144
  2. 4244
  3. 4344
  4. 4044

Answer (Detailed Solution Below)

Option 1 : 4144
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यूपी पुलिस SI (दरोगा) सामान्य हिंदी मॉक टेस्ट
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दिले:

GP मधील 4 पदांची बेरीज, दिलेली पहिली टर्म 16 आहे आणि सामान्य गुणोत्तर 6 आहे.

वापरलेले सूत्र:

फॉर्मची प्रगती a, ar, ar 2 , ar 3 , ........ आहे भौमितिक प्रगती म्हणून ओळखली जाते (जेथे, a प्रथम पद आहे आणि r हे सामान्य गुणोत्तर आहे)

GP च्या n पदांची बेरीज, Sn = \(\dfrac{a(r^n-1)}{(r-1)}\) , जेथे r > 1

गणना:

आता, a = 16, r = 6, n = 4

Sn = \(\dfrac{16 × (6^4 - 1)}{(6 - 1)}\)

\(\dfrac{16 × (1296 - 1)}{(6 - 1)}\)

\(\dfrac{16 × 1295}{5}\) = 16 x 259 = 4144

Sn = 4144

∴ उत्तर 4144 आहे

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