Maths / Arithmetic Progression / Find Last Term When First Term, Number of Terms and Sum of N Terms is Given

QUESTION
 

Find the 12th term of an AP whose first trem  4 and sum of 12 terms is 366

OPTIONS
A. 

58

B. 

54

C. 

57

D. 

65

Right Option : C

EXPLANATION
Explain TypeExplanation Content
Text

large S_n = frac{n}{2}(a+l)

large 366 = frac{12}{2}(4+l)

366 = 6(4+l)

61= 4+ l

l = 61-4 = 57

 

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