Question

find the sum of the following series 7,25/3,29/3,11......upto 12 terms

Answer 1

here given a=7 ,d=4/3 and n=12
Since sum of n terms= n/2[2a+(n-1)*d]
therefore
Sum of 12 terms =12/2[2*7+11*4/3]
=6[14+44/3]=172

Hope it helps you....

Answer 2

step by step explanation