Maths / Arithmetic Progression / General Term Of an AP

QUESTION

Find the general term of an AP -21,-17,-13,.....

 OPTIONS A. 3n-25 B. 3n-25 C. 4n-25 D. 4n+25
Right Option : C

EXPLANATION
Explain TypeExplanation Content
Text

$\dpi{120} \fn_jvn \large a=-21, d= 4$

$\dpi{120} \fn_jvn \large a_n=a+(n-1)d$

$\dpi{120} \fn_jvn \large a_n= -21+(n-1)4= -21+4n-4=4n-25$

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