Two series I and II are given below. Each series contains one incorrect term and follows a distinct pattern. Series I: a a a , b + 5 b+5 b + 5 , c + 8...

Banking SBI PO Prelims Medium Simplification/ Approximation MCQ

Question

Two series I and II are given below. Each series contains one incorrect term and follows a distinct pattern.

Series I: $a$ , $b+5$ , $c+8$ , $87$, $412$, $2185$, $13326$

Series II: $b+4$ , $c+8$ , $36$, $a+50$ , $79$, $111$, $152$

Given:

(i) The quadratic equation $10b x^2 - (21 - a)x + 3 = 0$ has roots $\frac{z}{10}$ and $\frac{y}{20}$ , where $\frac{z}{10} > \frac{y}{20}$ .

(ii) Any multiple of $y$ ends with digit zero.

(iii) $c - z = 9$ and the LCM of $z$ and $5$ is $15$.

Question: Find the LCM of $y$ , $z$ , and $c$ .

$60$

$10$

$15$

$25$

$20$

number serieslcmquadratic equationrootsalgebra

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