The first, second and last terms of an A.P. are 4, 7 and 31 respectively, then

The first, second and last terms of an A.P. are 4, 7 and 31
respectively, then

(1) the third term is 15

(2) the no. of terms is 10

(3) the sum of the terms is 155

(4) None of these

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The first, second and last terms of an A.P. are 4, 7 and 31 respectively, then (1) the third ter..

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( 2 ) the no. of terms is 10

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