356 x 936 - 356 x 836 = 356 x (936 - 836 )
= 356 x 100
= 35600.

Correct Option: A

356 x 936 - 356 x 836 = 356 x (936 - 836 )
= 356 x 100
= 35600.

Let 24 / 18 = N / 6
Then, 18N = 24 x 6

Correct Option: D

Let 24 / 18 = N / 6
Then, 18N = 24 x 6
∴ N = ( 24 x 6) / 18
= 8.

√ N / 196 = 72 / 56 =9/7
Then, N/196 = 9/7 x 9/7 = 81 / 49

Correct Option: C

√ N / 196 = 72 / 56 =9/7
Then, N/196 = 9/7 x 9/7 = 81 / 49
So, N = (81 x 196) / 49 = 324.

Given Exp. = 4 / 7 + {(2q - p) / (2q + p)}
Dividing numerator as well as denominator by q,
Exp = 4/7 + {2-p/q) / (2 + p/q)}

Correct Option: C

Given Exp. = 4 / 7 + {(2q - p) / (2q + p)}
Dividing numerator as well as denominator by q,
Exp = 4/7 + {2-p/q) / (2 + p/q)}
= 4/7 + {(2 - 4/5) / (2 + 4/5)}
= 4/7 + 6/14
= 4/7 + 3/7
=7/7
=1.

∵ √3ⁿ = 81
⇒ 3^n/2 = 3⁴

Correct Option: D

∵ √3ⁿ = 81
⇒ 3^n/2= 3⁴
⇒ n/2 = 4
⇒ n = 8.