Multiple Choice Questions

19 21 45 139 2811 ........

Logical Reasonong (PCS) Number series

19, 21, 45, 139, ?, 2811

1780

786

1290

561

Answer – 561
Explanation :
19*1+2 = 21
21*2+3 = 45
45*3+4 = 139
139*4+5 = 561
561*5+6 = 2811

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