Assertion (A) & Reason (B) MCQ

MCQ 11 Mark

Assertion (A): The sum of series with the nth term $t_n=(9-5 n)$ is 220 when no. of terms $n=6$.
Reason (R): Sum of first $n$ terms in an A.P. is given by the formula: $S n=2 n \times[2 a+(n-1) d]$

✓
Both A and R are true and R is the correct explanation of A.
B
Both A and R are true but R is not the correct explanation of A.
C
A is true but R is false.
D
A is false but R is true.

Answer

Correct option: A.

Both A and R are true and R is the correct explanation of A.

(A) Both A and R are true and R is the correct explanation of A.
Explanation: Both A and R are true and R is the correct explanation of A.

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MCQ 21 Mark

Assertion $(A):$ Two identical solid cubes of side a are joined end to end. Then the total surface area of the resulting cuboid is $10 a^2.$
Reason $(R):$ The total surface area of a cube having side $a = 6 a^2.$

✓
Both $A$ and $R$ are true and $R$ is the correct explanation of $A$.
B
Both $A$ and $R$ are true but $R$ is not the correct explanation of $A$.
C
$A$ is true but $R$ is false.
D
$A$ is false but $R$ is true.

Answer

Correct option: A.

Both $A$ and $R$ are true and $R$ is the correct explanation of $A$.

Both $A$ and $R$ are true and $R$ is the correct explanation of $A.$
Both $A$ and $R$ are true and $R$ is the correct explanation of $A$.

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Maths Assertion (A) & Reason (B) MCQ

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