Question

Answer the question No.26​

Answer 1

Answer:

-280

Step-by-step explanation:

An=5-6n

put n=1, a=-1

n=2, a2=-7

as, a=-1, n=10 and d=-6

Sn=n/2[2a+(n-1)d]

S10=10/2[(2×-1)+(10-1)(-6) ]

=5[-2+(-54)]

=5(-56)

=-280

Answer 2

Answer:

-280is the answer............,..........