Q. 19. The first and the last term of an A.P. are 17 and 350 respectively. If the common difference is 9, how many terms are there in the A.P. and what is their sum?
Sol. 1st term, a = 17, Last term, an = 350
Common difference, d = 9
an = a + (n – 1) d
Q. 20. Prove that.
Sol.
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