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13 14 16 21 31 ?
(a) 45
(b) 49
(c) 48
(d) 50
(e) 44
in Quantitative Aptitude
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$\\13+0^{2}+1=14 \\14+1^{2}+1=16 \\16+2^{2}+1=21 \\21+3^{2}+1=31 \\31+4^{2}+1=48$

 

Hence,Option$(C) 48 . $
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