Question

solve the 16th question

Answer 1

T1=1/2(1)[7(1)-1]
=1/2(7-1)
=1/2(6)
=3

T2=1/2(2)[7(2)-1]
=14-1
=13

T3=1/2(3)[7(3)-1]
=1/2(3)(21-1)
=1/2(3)(20)
=3(10)
=30

T4=1/2(4)[7(4)-1]
=2(28-1)
=2(27)
=54

The answer is 3,12,30,54