Question

1. If 'n'th term of an AP is 3n+7 then 10th term is​

Answer 1

Answer:

3925

4100

4175

8200

Answer :

C

Solution :

As given, nth term

Tn=3n+7

Sum of n term, Sn=∑Tn

=∑(3n+7)=3∑n+7∑1

=3n(n+1)2+7n=n[3n+3+142]=n[3n+172]

Sum of 50 terms S50=50[3×50+172]

=50[1672]=25×167=4175

Step-by-step explanation:

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