Question

the sum of five numbers in A.P. is 15 and the sum of their squares is 55 ,find the numbers

Answer 1

ANSWER:

The number are 1,2,3,4,5

As the sum of them =1+2+3+4+5

=15

And sum of their square=1^2+2^2×3^2+4^2+5^2

=1+4+9+16+25

=55