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what is the common deference of an ap in which a21-a7=84

Posted by Anvi Raj Muskan 6 years, 10 months ago

CBSE > Class 10 > Mathematics

2 answers

Yogita Ingle 6 years, 10 months ago

Given.... a₂₁ - a₇ = 84
⇒ {a + (21 - 1 ) d} - {a + (7 - 1) d} = 84
⇒ a + 20d - a - 6d = 84
⇒14 d = 84
⇒d = 84/ 14
⇒ d = 6
Required Common Difference is 6.

0Thank You

??Róyál⛔⛔ ????Himánshú⚡⚡ 6 years, 10 months ago

D =6

1Thank You

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