Question

someone please solve this question
Q49

Answer 1

=f(1)+f(2)+f(3)+...............+f(10)
=3-4(1)+3-4(2)+3-4(3)+...........+3-4(10)
=3x10-4(1+2+3+...............+10)----------------(1)
Now 1,2,3.......10 forms an ap
a=1 d=1
S10=10/2(2+9)
=55
Put s10in eq (1)
=30-225
=-195is the reqd ans

Answer 2

Final Answer : (- 190 )