Explanation:

1 and 2 only

In summer, there is no counter-equatorial current: This statement is correct. During the summer monsoon season, the southwest monsoon winds in the northern Indian Ocean result in the generation of a strong southwestward surface current, and there is generally no well-defined counter-equatorial current during this period.

The pattern of ocean currents is mostly affected by the monsoon winds: This statement is correct. The monsoon winds, both southwest (during summer) and northeast (during winter), have a significant impact on the ocean currents in the north Indian Ocean. These winds influence the direction and strength of the currents.

In winter, the counter-equatorial current flows from east to west due to the northeast trade wind: This statement is not correct. In winter, the northeast trade winds result in the generation of an equatorial current flowing from east to west in the northern Indian Ocean, not a counter-equatorial current.