Question

calculate on head, the sums of the following arithmetic sequences 1)51+52+53+.... +70 2)1 1/2 +2 1/2+... +12 1/2 3)1/2+1 +1 1/2+ 2+2 1/2+.... +12 1/2​

Answer 1

Answer:

i) :- 1210

ii) :- 84

Step-by-step explanation:

Sn is denoted as sum of n numbers

Tn is denoted as nth term of the series

d is common difference

a is known as first term

n is number of terms

thanks.

Answer 2

Answer:

step by step equation explanation