1. the first and the last term of an ap are 17 and 350 respectively. if the common difference is 9 ,how many terms are there in their AP and what is their sum.
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1. the first and the last term of an ap are 17 and 350 respectively. if the common difference is 9 ,how many terms are there in their AP and what is their sum.
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a+16d
a+16 *9
a=135