If the sum of the first 11 terms of an arithmetic progression equals that of the first 19 terms, then what is the sum of the first 30 terms?

If log₃2, log₃(2^x – 5), log₃(2^x – 7/2) are in arithmetic progression, then the value of x is equal to

21 goats eat as much as 15 cows. How many goats each as much as 35 cows?

A. Some babies are boys; Some boys are fathers; Some babies are fathers
B. Some films are books; Some books are good; Some films are good
C. Some fruits are sweet; Some mangoes are sweet; Some fruits are mangoes
D.Some mothers have babies; Some babies are boys; Some mothers have boys

No bird is an animal. All birds are insects

(I)No insect is animal

(II)No animal is insect

Which of the following element  is lightest and has the atomic number 1?

Complete the series 1, 3, 4, 13, 53, ___

Which of the following statements is NOT true?

33 39 57 87 129 (?)

The eldest is