which term of an ap 3,8,13,18,... is78?
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check out the picture..........
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a=3. d=5. Tn=78
Tn= a+(n-1)d
78=3+(n-1)5
78-3=5n-5
75+5=5n
n=80/5
n=16
Tn= a+(n-1)d
78=3+(n-1)5
78-3=5n-5
75+5=5n
n=80/5
n=16
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