Question

find the 20 th term of of A.P 3,9,15​

Answer 1

Answer:

$\huge{\underline{\underline{Given→}}}$

• $\sf\green{A.P=3,9,15,........}$

$\huge{\underline{\underline{To\:Find→}}}$

$\sf\purple{→20th\:term\:of\:the\:given\:A.P}$

$\huge{\underline{\underline{Answer→}}}$

• $a=3$
• $d=6$

$\sf{\underline{\underline{\red{\implies{For\:20th\:term:-}}}}}$ an=a+(n-1)d

$\sf\blue{→an=a+(n-1)d}$

$\sf\blue{→a20=a+(20-1)d}$

$\sf\blue{→a20=a+19d}$

$\sf\blue{→a20=3+19(6)}$

$\sf\blue{→a20=3+114}$

$\sf\blue{→a20=117}$

$\sf{\boxed{\boxed{\pink{→a20=117✔}}}}$

$→$ So the 20th term of the given A.P is 117 which is the required answer.

HOPE IT HELPS.

Answer 2

Answer:

A20 = 117

so the 20th term of A.P 3,9,15 is 117

Step-by-step explanation:

hope it's helpful ☺️