Question

For an AP if the difference of 25th and 20th term is 45, find the common difference

Answer 1

Answer:

T25 - T20 = 45

a + 24d - a + 19d = 45

24d - 19d = 45

5d =45

d = 9

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Answer 2

Let first term be a,

According to question,

a 25 - a20=45

⟹a+24d−(a+19d)=45

⟹5d=45

So, d=9

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