Question

if an ap an=2n-1 then the product of first three terms is
a)10
b)12
c)15
d)18​

Answer 1

SOLUTION

TO CHOOSE THE CORRECT OPTION

In an AP $\sf{a_n = 2n - 1}$ then the product of first three terms is

a) 10

b) 12

c) 15

d) 18

EVALUATION

Here it is given that for an arithmetic progression

$\sf{a_n = 2n - 1}$

Putting n = 1 , 2 , 3 we get

First term = 2 - 1 = 1

Second Term = 4 - 1 = 3

Third term = 6 - 1 = 5

Hence the required product of first three terms

= 1 × 3 × 5

= 15

FINAL ANSWER

Hence the correct option is c) 15

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Answer 2

Answer:

In an AP \sf{a_n = 2n - 1}a

n

=2n−1 then the product of first three terms is

a) 10

b) 12

c) 15

d) 18

EVALUATION

Here it is given that for an arithmetic progression

\sf{a_n = 2n - 1}a

n

=2n−1

Putting n = 1 , 2 , 3 we get

First term = 2 - 1 = 1

Second Term = 4 - 1 = 3

Third term = 6 - 1 = 5

Hence the required product of first three terms

= 1 × 3 × 5

= 15

FINAL ANSWER

Hence the correct option is c) 15