1.

The 15th term of (3 × 5) + (7 × 8) + (11 × 11) + . . . . is (1) 225 (2) 813 (3) 2773 (4) 3473

Answer»

Correct option(3) 2773

Explanation:

The first factors are in A.P., so also the second factors. 

The fifteenth term of 3 × 5 + 7 × 8 + . . . is 

[3 + 14 × 4] [5 + 14 × 3] = 59 × 47 = 2773 



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