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Which term of the AP: 3,8,13,18,.......,is …

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Which term of the AP: 3,8,13,18,.......,is 78 ?

Posted by Sahil Singh 5 years, 8 months ago

CBSE > Class 10 > Mathematics

1 answers

Vishwash Kushwaha Kushwaha 7 years, 4 months ago

As we know that Formula in question Tn= a+(n_1)d Tn=78, a=3, n=?, d=8_3=5 78=3+(n_1)5 78=3+5n_5 78+2=5n 80=5n n=16

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