Question

please answer fast ...

Answer 1

Answer:

Let the value of the prices be

x, x - 20, x - 40, .....

This is an arithmetic sequence with first term (a) = x and common difference (d) = -20.

Given,

S7 = 700

Sn = begin mathsize 12px style straight n over 2 end style [2a + (n - 1)d]

Thus, the values of the prizes are Rs. 160, Rs. 140, Rs. 120, Rs. 100, Rs. 80, Rs, 60, and Rs. 40.

Answer 2

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