Gus plzzz help me ..
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Himaanshusingh:
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i am busy in studying
Answers
Answered by
6
Answer:
15
Step-by-step explanation:
given common difference = 3
a20 - a15 = ?
a20 = a + (20-1)d { an = a+(n-1)d }
= a + 19d
similarly
a15 = a + 14d
a20 - a15 = a + 19d - ( a + 14d)
= a + 19d - a - 14d
= 5d
= 5(3) = 15
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