what is the common difference of 1n a.p in lwhich a21=a2=84
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Let a is the first term and d is the common difference of an A.P.
tn= a+(n -1)d
a21= a+(21-1)d
= a+20d ..........(1)
a2= a+(2-1)d
= a+d .............(2)
From (1)&(2)
a+20d - a+d = 84
21d = 84
d = 84/21
d = 4
4 is your answer.....
Hope u get it....!❤️❤️❤️
tn= a+(n -1)d
a21= a+(21-1)d
= a+20d ..........(1)
a2= a+(2-1)d
= a+d .............(2)
From (1)&(2)
a+20d - a+d = 84
21d = 84
d = 84/21
d = 4
4 is your answer.....
Hope u get it....!❤️❤️❤️
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