1.

The sum of first 20 and first 50 terms of an AP is 420 and 2550. Find the eleventh term of a GP whose first term is the same as the AP and the common ratio of the GP is equal to the common difference of the AP. (a) 560 (b) 512 (c) 1024 (d) 2048 

Answer»

Correct option (d) 2048    

Explanation: 

The first term of the given AP is 2 and the common difference is also 2. Thus, the 11th term of the GP = 2 × 210 = 2048.



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