Question

the sum of the five terms in a.p. in 35 and product of first and last number is 33 .find the number.

Answer 1

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
49-4d²=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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