GS5. Which of the following is a greenhouse gas? University Of Sindh mcqs test

                                                                        

EXPLANATION

IQ2. What is the next number in the series: 3, 8, 18, 38, ___?

a) 68

b) 78

c) 88

d) 98

ANSWER: b) 78

EXPLANATION:

The sequence is 3,8,18,38.

Here (3×2)+2=8

(8×2)+2=18

(18×2 )+2=38

Therefore (38×2)+2=78

Next no in sequence is 78.