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For an A.P. if a25 - a20 = 45, then d equals to:
Answer & Solution
Correct Answer:
Option
A
an = a + (n - 1) × d
⇒ a25 = a + 24d
and a20 = a + 19d
a25 - a20 = 45
⇒ a + 24d - a - 19d = 45
⇒ 5d = 45
⇒ d = 9
⇒ a25 = a + 24d
and a20 = a + 19d
a25 - a20 = 45
⇒ a + 24d - a - 19d = 45
⇒ 5d = 45
⇒ d = 9
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