Answers

2015-02-08T11:51:09+05:30
F+f+d+f+2d+f+3d+f+4d=35
5f+10d=35
(f+2d)5=35
f+2d=7
f=7-2d
f+4D=7+2D
(7+2d) (7-2d)=33
49-4d
²=33
4d²=16
d²=4
d=+ve 2 or -ve 2
number=3,5,7,9,11...
or  11,9,7,5,3...


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