please anwer this question
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I don't know the answer.
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Step-by-step explanation:
=> suppose AP is a, a+d,a+2d,a+3d,a+4d,...,a+199d
=> some of even terms
=> a+d + a+3d + a+5d + a+7d + ... + a+199d = 2020
=> (a+a+..+100 times a) + d(1+3+5+7+..+199) = 2020
=> 100a + d ((100/2)*(1+199)) = 2020
=> 100a + d*(50*200) =2020
=> 100a + 10000 = 2020 .........@1
=> sum of odd terms
=> (a + a+2d + a+4d + .... + a+198d) = 2019
=> 100a + 2d(1+2+3+...+99) = 2019
=> 100a + 2d*(99*100)/2 = 2019
=> 100a + 9900d = 2019 ........@2
=> @1 - @2
=> (10000 - 9900)d = 2020 - 2019
=> (100)d = 1
=> d = 1/100
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