कुछ छात्र एक पंक्ति में बैठे हैं जिसमें X बाएँ छोर से सत्रवें स्थान पर है और Y दाएँ छोर से चौदहवें स्थान पर है। यदि वे परस्पर अपने स्थान बदल लेते हैं, तब X बाएँ छोर से सातवें स्थान पर है। पंक्ति में कितने छात्र हैं?

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RRB ALP Previous Paper 7 (Held On: 13 Aug 2018 Shift 2)
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  1. 20
  2. 19
  3. 21
  4. 22

Answer (Detailed Solution Below)

Option 1 : 20
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X और Y के स्थान को सीधी रेखा के रूप में दर्शाते हैं,

13-Aug Shift 2 Shivraj 27Q Rashi (1) images Q17

अब ये अपने स्थान बदलते हैं और X बाएँ छोर से सातवें स्थान पर आ जाता है।

13-Aug Shift 2 Shivraj 27Q Rashi (1) images Q17a

अब हम देख सकते हैं कि X बाएँ छोर से सातवें स्थान पर है और दाएँ छोर से चौदहवें स्थान पर है।

इस प्रकार, इस पंक्ति में कुल लड़के = 7 + 14 – 1 = 20
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