Maths / Arithmetic Progression / Sum of First n Terms

QUESTION
 

Find the large 12^t^h term of the AP whose first term is 9 and common difference is 10.

OPTIONS
A. 

121

B. 

123

C. 

119

D. 

117

Right Option : C

EXPLANATION
Explain TypeExplanation Content
Text

We have              a = 9 and d = 10

We kanow that     a_n  = a + (n - 1)d

rightarrow                      a_1_2  = 9 + (12 - 1) (10) = 9 + 110 = 119

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