Q 7 Arithmetic and Geometric Sequences

The 7^th term of the Geometric Progression 2, 6, 18, ... is

• 5832

• 2919

• 1458

• 729

If a, G, b are in Geometric Progression then ‘G’ is said to be

• arithmetic mean

• geometric mean

• standard deviation

• none of above

If the sequence does not has a last term, then it is said to be

• finite sequence

• arithmetic sequence

• infinite sequence

• none of above

The Geometric Progression between −4 and −9 is

• ±8

• −8

• ±6

• −6

The arithmetic mean between a and 10 is 30, the value of ‘a’ should be

• 45

• 60

• 50

• 53

Geometric mean is calculated by

• ± √ab

• ± ab

• (a + b)²

• a - b ⁄ 2

Three arithmetic means between 11 and 19 are

• 12, 14, 15

• 13, 15, 17

• 13, 14, 15

• 14, 15, 17

If a = 4, a_n = 110, d = 2, then the value of n should be

• 51

• 52

• 53

• 54

The arithmetic mean between √5 and 3√5 is

• 2√5

• 4√5

• √5

• 5

If r = 10, a_n = 100, a = 1 then ‘n’ should be equal to

• 2

• 1

• 4

• 3