which term of the AP 3,15,27,39.........will be in 120 more than the 21st term
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Answered by
1
21st term =a+20d=3+240=243
120more=243+120=363
363 is some nth term
it can be written as 3+(n-1)d
363=3+(n-1)12
n=31
ans is 31st term ie 363
120more=243+120=363
363 is some nth term
it can be written as 3+(n-1)d
363=3+(n-1)12
n=31
ans is 31st term ie 363
Answered by
0
Given,
AP:-3,15,27,39.......
Here, a= 3
d= 15-3 =12
a(n) = a+(n-1)×d
a(21)= 3+(21-1)×12
=3+20×12
=3+240
=243
Given,
a(21)+120
=243+120
=363...which is the reqd. answer
AP:-3,15,27,39.......
Here, a= 3
d= 15-3 =12
a(n) = a+(n-1)×d
a(21)= 3+(21-1)×12
=3+20×12
=3+240
=243
Given,
a(21)+120
=243+120
=363...which is the reqd. answer
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