Question

Write down the sum 10 th term of the given sequence 23,21,19,....,5

Answer 1

Step-by-step explanation:

a=23

d=-2

an=5

n=10

Sn=N/2(2A+N-1×d)

Sn=10/2[2×23+(10-1)-2]

Sn= 5[46+(9)2]

Sn=5[46+18]

Sn=5[64]

Sn=320

Answer 2

Answer:

The sequence given is 23,21,19,.......,5

'a' = 23, 'd' = -2, 'n' = 10, l = 5 , S = ?

S = n/2{a+l}

S = 10/2{23+5

S = 5{28}

S = 140

The Sum of 10th term is 140.