RPF Constable previous year question
Find the missing number in the series: 39, 79, 159, 319, 639, ?
Asked in RPF Constable 2025: Shift 34 ┬╖ Reasoning
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Correct answer: (B) 1279
Each term = previous term x 2 + 1. So next term = 639 x 2 + 1 = 1279.
рд╣рд┐рдВрджреА рдореЗрдВ рдкреНрд░рд╢реНрди
рд╢реНрд░реГрдВрдЦрд▓рд╛ рдореЗрдВ рд▓реБрдкреНрдд рд╕рдВрдЦреНрдпрд╛ рдЬреНрдЮрд╛рдд рдХреАрдЬрд┐рдП: 39, 79, 159, 319, 639, ?
рдЙрддреНрддрд░ рдЬрд╛рдБрдЪрдиреЗ рдХреЗ рд▓рд┐рдП рдХрд┐рд╕реА рд╡рд┐рдХрд▓реНрдк рдкрд░ рдЯреИрдк рдХрд░реЗрдВред
рдЙрддреНрддрд░ рдФрд░ рд╡реНрдпрд╛рдЦреНрдпрд╛ рджреЗрдЦреЗрдВ
рд╕рд╣реА рдЙрддреНрддрд░: (B) 1279
рдкреНрд░рддреНрдпреЗрдХ рдкрдж = рдкрд┐рдЫрд▓рд╛ рдкрдж x 2 + 1ред рдЕрддрдГ рдЕрдЧрд▓рд╛ рдкрдж = 639 x 2 + 1 = 1279ред
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