allery2, ?, 12, 20, 30 मध्ये एक संख्या लपलेली आहे. ती लपलेली संख्या कोणती?
A6
B8
C4
D10
Answer & Solution
Correct answer: A. 6
पदे n x (n + 1) चे अनुसरण करतात: 1x2, 2x3, 3x4, 4x5, 5x6, त्यामुळे दुसरे पद 6 आहे.
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