7     13       31       97      391   1957  

    13   (1)      (2)      (3)      (4)     (5)

    What will come in place of (4) ?

  • 584
  • 535
  • 596
  • 586
  • 574
  • Explanation:

    7(X1+6) 13(X2+5) 31((X3+4) 97(X4+3) 391(X5+2)1957

    13(X1+6) 19(X2+5) 43(X3+4) 133(X4+3) 535(X5+2)2677

Related Question & Answers

7     13       31       97      391   19
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