The average score of a batsman after his 50th innings was 46.4. After 60th innings, his average Score increases by 2.6. What was his average score in the last ten innings?

The average score after 50 innings was 46.4, so the total score after 50 innings was 46.4 * 50 = 2320.

After 60 innings, the average score increased by 2.6. The new average score is 46.4 + 2.6 = 49. The total score after 60 innings was 49 * 60 = 2940.

The total score in the last ten innings (from 51st to 60th) is the difference between the total score after 60 innings and the total score after 50 innings: 2940 - 2320 = 620.

To find the average score in the last ten innings, divide this total by the number of innings (10): 620 / 10 = 62.

Therefore, the average score in the last ten innings was 62.

Analyzing the options: A) 122 - Incorrect. This would imply a much higher total score for the last 10 innings. B) 91 - Incorrect. This is also too high. C) 62 - Correct. This matches our calculation. D) 49 - Incorrect. This is the new overall average after 60 innings, not the average for the last 10 innings.

The final answer is C.