If a4 =2017+2018-2019 and
a5=2018+2019-2020 then find
a1990 =?
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2
Answer:
4002
Step-by-step explanation:
a4 = 2017+2018-2019
a4 = 2016
a5 = 2018+2019-2020
a5 = 2017
By using A.p
d = a5 -a4
d = 1
formula An= a+ (n-1)*d
a5 = a + (5-1) *1
2017= a +4
2017-4 = a
a= 2013
An = a + (n-1)*d
A1990 = 2013 + (1990-1) *1
A1990= 2013+1989
A1990 =4002
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