Question

The sum of first five terms of 1.2,2.3,3.4,............. is?

Answer 1

s5=5/2(2(1.2)+4(1.1))
s5=5/2(2.4+4.4)
s5=5/2(6.8)
s5=5(3.4)
s5=17.0
therefore,
a=1.2
d=1.1
n=5
....
.....

thank u

Answer 2

Answer:

answer is 17.0

Step-by-step explanation:

the common difference between 2.3 and 1.2 is 1.1

and common difference is same for all the terms

so fourth term is 3.4 + 1.1 = 4.5

and fifth term is 4.5 + 1.1 = 5.6

now we have all the five terms they are :

1.2, 2.3 ,3.4 , 4.5 , 5.6

add those : 1.2 +2.3 + 3.4 + 4.5 + 5.6

we got answer 17.0

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