Question

plz answer this very important

Answer 1

Hope it helps you

Follow me

Mark the answer as brainliest pls ❤️❤️

Answer 2

$\huge\underline\mathbb{\red S\pink{O}\purple{L} \blue{UT} \orange{I}\green{ON :}}$

★ Given that,

Find the common difference (d) of an AP

$\tt\:a_{21}-a_{7}=84$

★ Let,

• a21 = a + 20d
• a7 = a + 6d

$\tt\:⟹\:(a + 20d) - (a + 6d) = 84$

$\tt\:⟹a + 20d - a - 6d = 84$

$\tt\:⟹14d = 84$

$\tt\:⟹d = \frac{84}{14}$

$\tt\:⟹d = 6$

$\underline{\boxed{\bf{\purple{∴ The\:common\:difference\:of\:AP\:a_{21}\:-\:a_{7}\:=\:6.}}}}$