Which term of A.P.3,8,13,18......will be 55 m9re than its 20th term?
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Hi
sol. here,a=3
d=5
a20=a+19d
=3+19*5
=95+3
a20=98
55 more than a20
98+55
=153
now,let an=153
according to the formula
an=a+(n-1)d
153=3+(n-1)5
153=3+5n-5
153+2=5n
5n=155
n=31
hope it helps you!
thanx
sol. here,a=3
d=5
a20=a+19d
=3+19*5
=95+3
a20=98
55 more than a20
98+55
=153
now,let an=153
according to the formula
an=a+(n-1)d
153=3+(n-1)5
153=3+5n-5
153+2=5n
5n=155
n=31
hope it helps you!
thanx
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