1.

The sum of the three number in ap is 21 and their product is 231 find the numbers.

Answer» HII There!!!


Let the AP be :-. (a-d), a, (a+d) 

=)(a-d)+a+(a+d) =21
=)3a=21
=)a=7

(a-d)×a×(a+d)=231
(a×a-d×d) ×a=231
(7×7-d×d)×7=231
(7×7-d×d)=231/7
(7×7-d×d)=33
d×d=49-33
d×d=16
d=4
So, the A. P. is 3, 7, 11.



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