Question

find the 15th term of the ap 3,6,9....using suitable formula​

Answer 1

$\huge\boxed{\underline{\bf { \red S \green O \pink L \blue U \orange T \purple I \red O \pink N \green{..}}}}$

A.P = 3 , 6 , 9 ....

Here

• a = 3
• d = 3
• n = 15

By using A.P formula

$\large \red\bigstar \: \boxed{ \bf \green{A_n = a + (n - 1)d}}$

Substitute values in formula

$\longmapsto \sf A_{15} = 3 + (15 - 1)3$

$\longmapsto \sf A_{15} = 3 + (14)3$

$\longmapsto \sf A_{15} = 3 + 42$

$\longmapsto \sf A_{15} =45$