Or
For what values of a and b does the following pair of linear equations have an infinite number of solutions?
2x + 3y = 7
a (x + y) – b (x – y) = 3a + b – 2
Sol.
Q. 19. The first and the last term of an A.P. are 4 and 81 respectively. If the common difference is 7, how many terms are there in the A.P. and what is their sum?
Sol.
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