Question { 12355 }
wat will be the next number in the series....
1,3,5,9,12,21,..
Answer
next is 30........
b/w 1 n 3:2 is left 3 n 5 :4is left so one number b/w them.
b/w 5 n 9:7,8 is left 9 n 12: 10,11 is left so two nummbers.
b/w 12 n 21: 13,14,15,16,17,18,19,20 is left so eight numbers .
there b/w 21 and next number eight numbers should be left so 21+8=29. therefore next number is 30.