Q. 34.5( 38 Votes )

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Answer :

By given information we can form an A.P.

5000, 7000, 9000, ……

Hence, the first term a = 5000

Second term t1 = 7000

Third term t2 = 9000

Thus, common difference d = t2 – t1 = 9000 – 7000 = 2000

Here, number of terms n = 12

We need to find S12

Now, By using sum of nth term of an A.P. we will find it’s sum Where, n = no. of terms

a = first term

d = common difference

Sn = sum of n terms

Thus, on substituting the given value in formula we get, S12 = 6 × [ 10,000 + 11 × 2000]

S12 = 6 × [10,000 + 22,000]

S12 = 6 × 32,000

S12 = Rs. 192000

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