Which letter-cluster will replace the question mark (?)

Insert arithmetical signs in the equation for it to be correct

8 ? 4 ? 2 = 16

Which two signs should be interchanged to make the given equation correct?

39 ÷ 3 − 11 + 45 × 17 = 171 

Three of the following four figure pairs are alike in a certain way and thus form a group. Which is the oue that does not belong to that group?

Statement: "All dogs are animals. Some animals are cats.":

Conclusion1. Some dogs are cats.

Conclusion 2. Some animals are dogs. 

Which two numbers should be interchanged to make the given equation correct?

(12÷ 3) × 18 - 2× 4 + 42÷ 6 = 69

Four of the following five are equal in a certain way and form a group.

Which one is not related to that group?

MQ, BF, JN, UX, CG

Which of the following numbers will replace the question mark (?) in the given series?

4, 11, 19, 31, 52, 89, ?

If + means −, − means ×, × means ÷, and ÷ means +, what will be the value of the following expression?

5 ÷ 5 + 5 – 10 × 10 = ?

How many meaningful four-letter English words can be formed using T, U, K and S using each letter only once in each word?

From the given responses, find the missing letter in the series.

  MaN, SaH, YaB, ?