Question

What should come in place of the question mark (?) in the following number series.

6417, 5704, 4991, 4278, 3565, 2852 ?

(a) 2408 (b) 2426 (c) 7310 (d) 7130 (e) 2139

Answer 1

(e) The given number series is based on the following pattern:
6417 – 713 = 5704
5704 – 713 = 4991
4991 – 713 = 4278
4278 – 713 = 3565
3565 – 713 = 2852
? = 2852 – 713 = 2139
Hence, 2139 will replace the question mark.