Question

plzz solve this problem fast........

Answer 1

Hope it helps ya
Cheers :)

Answer 2

a=2
=T1+T2+T3+T4+T5=1/4 ( T6+T7+T8+T9+T10 ).
=a+a+d+a+2d+a+3d+a+4d=1/4 ( a+5d+a+6d+a+7d+a+8d+a+9d ).
=4 (5a+10d )=5a+35d.
4(5×2+10d)=5×2+35d.
4(10+10d)=10+35d.
40+40d=10+35d.
40d-35d=10-40.
5d= --30.
d= --6.
Tn = a+ (n-1)d
T20 = 2+(20-1) (--6)
T20 = 2+(19)-6
T20 = 2-114
T20= --112.

Sn = n/2 [2a+(n-1)d]
S20=20/2[2×2+(20-1)(-6)]
S20=10[4+19(-6)]
= 10 (4-114)
= 10 (--110)
= --1100
S20= --1100.