weich Term of an A. P3,8,13,18,........is 78?
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a=3,d=8-3=5, an=78
an=a+(n-1)d
78=3+(n-1)5
78-3=5n-5
75+5=5n
80/5=n
n=16
therefore it is a 16th term
an=a+(n-1)d
78=3+(n-1)5
78-3=5n-5
75+5=5n
80/5=n
n=16
therefore it is a 16th term
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