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Q.
In the following number series only one number is wrong. Find out the wrong number ? 6, 15, 35, 63, 143, 221, 323
A.
143
B.
63
C.
323
D.
35
View Answer
Correct choice: B
Explanation:
Here the series follows the pattern that, product of succesive prime numbers i.e, 2 × 3 = 6 3 × 5 = 15 5 × 7 = 35 7 × 11 = 77 11 × 13 = 143 13 × 17 = 221 17 × 19 = 323 So here in place of 77 the number 63 is written. So the wrong number is 63.
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