Question

1.2 +2.3 + 3 . 4, .......... then Sum of 5 terms = ?
1) 70 2) 60 3) 90
4) 12​

Answer 1

Answer:

17

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Answer 2

Step-by-step explanation:

a=1.2

common difference (d)= 1.1

nth= 5

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

Sn=5/2[2×1.2+(5-1)1.1]

Sn =5/2[2.4 +(4) 1.1]

Sn = 5/2[2.4+4.4]

Sn=5/2[6.8]

Sn=5/2×6.8

Sn= 5×3.4

Sn = 17

Ans.Thus, the sum of Five terms is 17.