1.

What should come in place of the question mark (?) in the following number series.3 7 13 ? 31 43 (a) 18 (b) 19 (c) 23 (d) 21 (e) None of these

Answer»

(d) The given number series is based on the following
pattern:
7 + 6 = 13
13 + 8 = 21
21 + 10 = 31
31 + 12 = 43
Hence, the number 21 will replace the question mark.



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