Synopsis IAS

Answer

Solution

UPSC Prelims

Mathematics

Theme:

Sequences and Series / श्रेणी और अनुक्रम

Q48 2019, Sequences and Series

What is X in the sequence 132, 129, 124, 117, 106, 93, X?

• The series is reducing by 3, 5, 7, 11, 13 ... i.e., by prime numbers starting with 3.

• So, the next prime will be 17.

• The value of X will be 93 – 17 = 76.

Q 48. 2019, Sequences and Series