Question

48. (1) संख्या श्रेणी का सही क्रम निम्नलिखित है-
1x1+1=2
2x2+2=6
6x3+3 = 21
21x4+4 = 88​

Answer 1

Next number= AxN+N,

Where

A is present number in the series.

N = 1,2,3, ,n.

First number in the series is. 1,N=1,

Next number =1x1+1=2;

Third number in the series=2x2+2=6.

Fourth number in the series=6x3+3=21,

Fifth number in the series=21x4+4=88.

Sixth number in the series=88x5+5=445

Seventh number in the series=445x6+6=2676

So answer is

505 is odd one in the series