Maths / Arithmetic Progression / Sum of First n Terms

QUESTION

Find the $\dpi{120} \fn_jvn \large 12^t^h$ 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     $\dpi{100} a_n$  = a + (n - 1)d

$\dpi{100} \rightarrow$                      $\dpi{100} a_1_2$  = 9 + (12 - 1) (10) = 9 + 110 = 119

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