2,4,12,42,176,?
a)810
b)890
c)680

• ans. 890
  2(1,2,6,21,88,?)=
  2(1,1*1+1,2*2+2,6*3+3,21*4+4,88*5+5)=2(1,2,6,21,88,445)
  thn series are 2,4,12,42,176,890
  thn no is 890
• 11 years agoHelpfull: Yes(1) No(0)