Maths / Arithmetic Progression / Sum of First n Terms

QUESTION
 

Find the 11^t^h term of the AP 10.0, 11.5, 11.0, 11.5,.......

OPTIONS
A. 

16

B. 

15

C. 

18

D. 

20

Right Option : B

EXPLANATION
Explain TypeExplanation Content
Text

Here     a = 10.0, d = 10.5 - 10.0 = 0.5

We know that

                       a_n = a + (n - 1)d

rightarrow                   a_1_1 = a + (11 - 1)d = 10.0 + 10(0.5) = 10.0 + 5.0 = 15.0

Thus,               a_1_1 = 15.0

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